1013-00001 · Genome Dx Therapeutics Inc · Closing

borrowers-counsel-legal-opinion.docx DOCUMENT Finance & Banking

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CALDERWOOD & HARKNESS LLP Attorneys at Law

555 California Street, 40th Floor San Francisco, California 94104 Telephone: (415) 773-6200 Facsimile: (415) 773-6201 www.calderwoodharkness.com

March 13, 2026

Pinnacle Venture Lending Corp., as Administrative Agent 2200 Sand Hill Road, Suite 400 Menlo Park, California 94025

Cobalt Life Sciences Fund III, L.P., as a Lender 600 Lexington Avenue, 22nd Floor New York, New York 10022

Pacific Fiduciary Services Inc., as Collateral Agent 350 Mission Street, Suite 1200 San Francisco, California 94105

Re: Bridge Loan Agreement dated March 6, 2026 (the "Loan Agreement") among Genome Dx Therapeutics Inc. (the "Borrower"), Pinnacle Venture Lending Corp. (as Administrative Agent and a Lender), Cobalt Life Sciences Fund III, L.P. (as a Lender), and Pacific Fiduciary Services Inc. (as Collateral Agent) — $15,000,000 Senior Secured Bridge Loan Facility

Ladies and Gentlemen:

We have acted as counsel to Genome Dx Therapeutics Inc., a corporation duly incorporated under the laws of the State of Delaware and qualified to transact business in the State of California (the "Borrower" or "GenomeDx"), in connection with the $15,000,000 Senior Secured Bridge Loan Facility (the "Facility") established pursuant to the Bridge Loan Agreement dated March 6, 2026 (the "Loan Agreement"), among the Borrower, Pinnacle Venture Lending Corp. ("Pinnacle"), as Administrative Agent and a Lender, Cobalt Life Sciences Fund III, L.P. ("Cobalt"), as a Lender, and Pacific Fiduciary Services Inc. ("Pacific Fiduciary"), as Collateral Agent for the benefit of the Secured Parties. This opinion letter is delivered to you pursuant to Section 4.01(f) of the Loan Agreement as a condition precedent to the initial funding under the Loan Agreement on the date hereof (the "Closing Date"). This opinion letter is addressed to Pinnacle, as Administrative Agent, Cobalt, as a Lender, and Pacific Fiduciary, as Collateral Agent (collectively, the "Addressees"). This matter is referenced internally as C&H Matter No. 14892.003.

1. Defined Terms and Transaction Documents

1.1 Defined Terms

Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Loan Agreement. As used herein, "Borrower" means Genome Dx Therapeutics Inc., a Delaware corporation; "Loan Agreement" means the Bridge Loan Agreement dated March 6, 2026; and "Transaction Documents" has the meaning given to such term in Section 1.2 below.

1.2 Enumeration of Transaction Documents

In rendering the opinions set forth herein, we have reviewed and are rendering opinions with respect to the following documents (collectively, the "Transaction Documents"):

1. Bridge Loan Agreement dated March 6, 2026, among Borrower, Pinnacle Venture Lending Corp. (as Administrative Agent and a Lender), Cobalt Life Sciences Fund III, L.P. (as a Lender), and Pacific Fiduciary Services Inc. (as Collateral Agent), together with all schedules, exhibits, and annexes thereto (the "Loan Agreement");

2. Security Agreement dated March 6, 2026, between Borrower (as Grantor) and Pacific Fiduciary Services Inc. (as Collateral Agent for the benefit of the Secured Parties), pursuant to which the Borrower has granted a security interest in substantially all of its personal property to secure the Obligations under the Loan Agreement (the "Security Agreement");

3. intellectual Property Security Agreement dated March 6, 2026, between Borrower and Pacific Fiduciary Services Inc. (as Collateral Agent), in short form suitable for recording with the United States Patent and Trademark Office (the "USPTO"), covering certain registered patents, patent applications, and trademarks of the Borrower (the "IP Security Agreement");

4. Common Stock Purchase Warrant dated March 6, 2026, issued by Borrower to Pinnacle Venture Lending Corp., for the purchase of 137,614 shares of common stock, par value $0.001 per share, of the Borrower (the "Pinnacle Warrant");

5. Common Stock Purchase Warrant dated March 6, 2026, issued by Borrower to Cobalt Life Sciences Fund III, L.P., for the purchase of 68,807 shares of common stock, par value $0.001 per share, of the Borrower (the "Cobalt Warrant" and, together with the Pinnacle Warrant, the "Warrants"); and

6. Intercreditor Agreement dated March 6, 2026, among Pinnacle Venture Lending Corp. (as Administrative Agent), Ridgeline Capital Partners LLC ("Ridgeline"), and Borrower, acknowledged by Pacific Fiduciary Services Inc. (as Collateral Agent), establishing the relative priorities of the security interests of the Secured Parties and Ridgeline in the assets of the Borrower (the "Intercreditor Agreement").

The Loan Agreement, Security Agreement, IP Security Agreement, the Warrants, and the Intercreditor Agreement are referred to herein collectively as the "Transaction Documents."

2. Documents and Items Examined

In rendering the opinions set forth herein, we have examined originals, or copies certified or otherwise identified to our satisfaction, of the following documents, certificates, instruments, and records:

1. The Transaction Documents, each as executed and delivered by the parties thereto on or about March 6, 2026;

2. The Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware on July 18, 2022, together with all certificates of amendment and certificates of designation filed therewith through the date hereof;

3. The Bylaws of Borrower, as amended and restated effective September 12, 2023, together with all amendments thereto through the date hereof;

4. Resolutions of the Board of Directors of Borrower, adopted by unanimous written consent on or about March 4, 2026, authorizing the execution, delivery, and performance of the Transaction Documents and the consummation of the transactions contemplated thereby, including the borrowing of up to $15,000,000 under the Loan Agreement, the grant of security interests in substantially all personal property of the Borrower, and the issuance of the Warrants;

5. A certificate of good standing of Borrower issued by the Secretary of State of the State of Delaware, dated March 5, 2026, which date is within ten (10) days of the date hereof;

6. A certificate of good standing (Certificate of Status — Foreign Corporation) of Borrower issued by the Secretary of State of the State of California, dated March 4, 2026, which date is within ten (10) days of the date hereof;

7. A Secretary's Certificate of Borrower dated as of the date hereof, delivered by Miriam Sato, General Counsel and Secretary of the Borrower, certifying as to (a) the Amended and Restated Certificate of Incorporation and all amendments thereto, (b) the Bylaws as amended and restated, (c) the resolutions of the Board of Directors of Borrower authorizing the Transaction Documents, and (d) the incumbency and specimen signatures of the authorized officers of Borrower who executed the Transaction Documents, specifically Dr. Ananya Mehta, Chief Executive Officer, and Robert Langford, Chief Financial Officer (the "Secretary's Certificate");

8. UCC-1 financing statements naming Borrower as debtor and Pacific Fiduciary Services Inc. as secured party, in the form to be filed with (a) the Secretary of State of the State of Delaware, as the jurisdiction of incorporation of Borrower, and (b) as a protective filing, with the Secretary of State of the State of California;

9. The results of Uniform Commercial Code, federal tax lien, judgment lien, and intellectual property lien searches conducted against Borrower (and certain trade name variations) in (a) the State of Delaware (Office of the Secretary of State), (b) the State of California (Office of the Secretary of State), and (c) the United States Patent and Trademark Office, each such search dated on or about the date hereof and delivered by Granite Harbor Health IT, Inc.;

10. The existing Equipment Financing Agreement dated December 15, 2023, between Borrower and Ridgeline Capital Partners LLC, with an outstanding principal balance of approximately $3,200,000 as of the date hereof, maturing in December 2027 (the "Ridgeline Equipment Agreement"); and

11. Such other documents, certificates, records, and instruments as we have deemed necessary or appropriate for purposes of this opinion, including records of proceedings and actions of the Board of Directors of Borrower made available to us.

In our examination of the foregoing documents and other materials, we have assumed, and have not independently verified, the completeness of the indices and filing records maintained by the governmental offices where we have conducted or caused to be conducted our searches. We have also made such inquiries of officers and representatives of the Borrower as we have considered relevant.

3. Assumptions

In rendering the opinions expressed herein, we have assumed, without independent investigation or verification, the following:

1. The genuineness of all signatures (other than the signatures of authorized officers of Borrower), the authenticity of all seals, and the competency of all persons executing documents on behalf of parties other than Borrower;

2. The authenticity and completeness of all documents submitted to us as originals, and the conformity to authentic originals of all documents submitted to us as copies, whether certified, photostatic, electronic, or otherwise;

3. The legal capacity of all natural persons who have executed or delivered any of the documents examined by us;

4. That each party to the Transaction Documents (other than Borrower) is duly organized, validly existing, and in good standing under the laws of its respective jurisdiction of organization, and has all requisite organizational power and authority to conduct its business as presently conducted;

5. That each party to the Transaction Documents (other than Borrower) has all requisite power and authority, and has taken all necessary organizational action, to execute, deliver, and perform its respective obligations under the Transaction Documents to which it is a party;

6. That the Transaction Documents have been duly authorized, executed, and delivered by each party thereto (other than Borrower), and constitute the legal, valid, and binding obligations of each such party, enforceable against each such party in accordance with their respective terms;

7. That the representations and warranties of Borrower set forth in the Transaction Documents and in the Secretary's Certificate are true, correct, and complete in all material respects as of the date hereof, and that no event has occurred since the date of such representations and warranties that would render any of them untrue, incorrect, or incomplete;

8. That the execution and delivery of the Transaction Documents by Borrower and the consummation of the transactions contemplated thereby will not violate any order, judgment, decree, or injunction of any court or other governmental authority binding on Borrower, except to the extent expressly opined upon in Section 4 below;

9. That the UCC-1 financing statements described in Section 2(8) above will be properly filed in the offices indicated therein and will contain the information required for effectiveness under applicable provisions of the Uniform Commercial Code, including the correct legal name of the Borrower as debtor and an adequate description of the collateral; and

10. That Pacific Fiduciary Services Inc., as Collateral Agent for the benefit of the Secured Parties, has given "value" within the meaning of Sections 1-204 and 9-203 of the Uniform Commercial Code, and that the other conditions to attachment of the security interests contemplated by the Security Agreement and the IP Security Agreement, other than those upon which we are opining herein, have been satisfied.

We have made no independent investigation of the factual matters set forth in the foregoing assumptions. To the extent that any of the foregoing assumptions proves to be incorrect, the opinions expressed herein may be adversely affected.

4. Opinions

Based upon and subject to the foregoing, and subject further to the qualifications and limitations set forth in Section 5 below, we are of the opinion that:

Opinion 4.1: Due Organization and Good Standing (Delaware)

The Borrower is a corporation duly incorporated, validly existing, and in good standing under the laws of the State of Delaware. In rendering this opinion, we have reviewed (a) the Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware (including all certificates of amendment and certificates of designation thereto), (b) the certificate of good standing of Borrower issued by the Secretary of State of the State of Delaware dated March 5, 2026, and (c) the Secretary's Certificate delivered by Miriam Sato. The Borrower's Delaware file number is 7481263. We note that our opinion with respect to the valid existence and good standing of Borrower under the laws of the State of Delaware is based solely on the certificate of good standing and the Secretary's Certificate referred to above, and we have not made any independent inquiry of the Secretary of State of the State of Delaware beyond our review of such certificate.

Opinion 4.2: Qualification and Good Standing (California)

The Borrower is duly qualified to transact business and is in good standing as a foreign corporation in the State of California. In rendering this opinion, we have reviewed the certificate of good standing (Certificate of Status — Foreign Corporation) issued by the Secretary of State of the State of California, dated March 4, 2026, and we have relied upon such certificate without independent investigation. We express no opinion as to the qualification of Borrower to transact business in any jurisdiction other than the State of California.

Opinion 4.3: Corporate Power and Authority

The Borrower has the corporate power and authority to (a) own, lease, and operate its properties and assets, (b) carry on its business as presently conducted, and (c) execute, deliver, and perform its obligations under each of the Transaction Documents, including the Loan Agreement, the Security Agreement, the IP Security Agreement, the Pinnacle Warrant, the Cobalt Warrant, and the Intercreditor Agreement, and to consummate the transactions contemplated thereby. Without limiting the generality of the foregoing, the Borrower has the corporate power and authority to borrow up to $15,000,000 under the Loan Agreement, to grant the security interests in substantially all of its personal property as contemplated by the Security Agreement and the IP Security Agreement, to issue the Warrants covering an aggregate of 206,421 shares of common stock (137,614 shares issuable under the Pinnacle Warrant and 68,807 shares issuable under the Cobalt Warrant), and to enter into the lien priority arrangements set forth in the Intercreditor Agreement with Ridgeline Capital Partners LLC. The Amended and Restated Certificate of Incorporation of Borrower authorizes the issuance of a sufficient number of shares of common stock to permit the exercise in full of each of the Warrants.

Opinion 4.4: Due Authorization

The execution, delivery, and performance by Borrower of each of the Transaction Documents, and the consummation by Borrower of the transactions contemplated thereby (including the borrowing of up to $15,000,000, the granting of the security interests described therein, and the issuance of the Warrants), have been duly authorized by all necessary corporate action on the part of Borrower, including resolutions of the Board of Directors of Borrower adopted by unanimous written consent on or about March 4, 2026. No stockholder approval is required under the Amended and Restated Certificate of Incorporation, the Bylaws, or the General Corporation Law of the State of Delaware for the execution, delivery, and performance of the Transaction Documents. In rendering this opinion, we have reviewed the Board resolutions and the Secretary's Certificate delivered by Miriam Sato, General Counsel and Secretary of Borrower, certifying the adoption, completeness, and continuing effectiveness of such resolutions as of the date hereof.

Opinion 4.5: Execution and Delivery

Each of the Transaction Documents has been duly executed and delivered by Borrower. The Loan Agreement, the Security Agreement, the IP Security Agreement, the Pinnacle Warrant, the Cobalt Warrant, and the Intercreditor Agreement were executed by authorized officers of Borrower, specifically Dr. Ananya Mehta, Chief Executive Officer, and/or Robert Langford, Chief Financial Officer, as certified in the incumbency certificates and specimen signatures attached to the Secretary's Certificate. We have compared the signatures appearing on the executed Transaction Documents with the specimen signatures included in the Secretary's Certificate and have confirmed their conformity.

Opinion 4.6: Enforceability

Each of the Transaction Documents constitutes the legal, valid, and binding obligation of Borrower, enforceable against Borrower in accordance with its respective terms. The foregoing opinion is subject to the Enforceability Qualifications set forth in Section 5.1 below.

Opinion 4.7: No Violation — Charter and Bylaws

The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not (a) violate, contravene, or conflict with the Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware (including all certificates of amendment and certificates of designation thereto), or (b) violate, contravene, or conflict with the Bylaws of Borrower, as amended and restated.

Opinion 4.8: No Violation — Material Agreements

The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not result in a breach of, constitute a default (or an event that, with the giving of notice or the passage of time, or both, would constitute a default) under, result in the acceleration of, create in any party the right to accelerate, terminate, modify, or cancel, or require any notice or consent under, any material agreement or instrument to which Borrower is a party or by which Borrower or any of its properties or assets are bound, to the extent such agreements and instruments have been identified to us by Borrower. This opinion is limited to the agreements and instruments listed on the schedule of material agreements provided to us by Borrower in connection with this transaction, which includes, among other items, the existing Equipment Financing Agreement dated December 15, 2023, between Borrower and Ridgeline Capital Partners LLC. We note that the Intercreditor Agreement addresses the relative priority of liens under the Ridgeline Equipment Agreement and the Transaction Documents, and we have confirmed that the execution and delivery of the Transaction Documents and the grant of the security interests thereunder are not prohibited by the terms of the Ridgeline Equipment Agreement, as modified by the Intercreditor Agreement. We have not, however, undertaken any independent investigation to determine whether there exist agreements or instruments to which Borrower is a party or by which Borrower is bound that were not identified to us.

Opinion 4.9: No Violation — Applicable Law

The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not violate any applicable law, statute, rule, or regulation of the State of California or the federal laws of the United States, in each case as currently in effect on the date hereof. This opinion is limited to the laws of the State of California and the federal laws of the United States that, in our experience, are normally applicable to transactions of the type contemplated by the Transaction Documents. We express no opinion as to the laws of any other jurisdiction, including the General Corporation Law of the State of Delaware, as to which we have relied on the assumptions and qualifications set forth herein and on the opinions of Delaware counsel, if any, delivered in connection with this transaction.

Opinion 4.10: Governmental Approvals

No consent, approval, authorization, license, permit, or order of, or filing, registration, or qualification with, any California state or federal governmental authority or regulatory body is required for the execution, delivery, or performance by Borrower of the Transaction Documents or the consummation of the transactions contemplated thereby, other than:

(a) the filing of UCC-1 financing statements with the Secretary of State of the State of Delaware and the Secretary of State of the State of California, as described in Section 2(8) above;

(b) the recording of the IP Security Agreement with the United States Patent and Trademark Office; and

(c) such consents, approvals, authorizations, orders, filings, registrations, and qualifications as have already been obtained or made and are in full force and effect as of the date hereof.

Opinion 4.11: Perfection of Security Interests (UCC)

Upon the filing of the UCC-1 financing statements, in the form examined by us, with the Secretary of State of the State of Delaware (as the jurisdiction in which Borrower is incorporated and organized) and, as a protective filing, with the Secretary of State of the State of California, the Collateral Agent will have a perfected security interest, for the benefit of the Secured Parties, in all right, title, and interest of Borrower in and to the personal property of Borrower described in the Security Agreement to the extent that a security interest therein may be perfected by the filing of a UCC-1 financing statement under Article 9 of the California Uniform Commercial Code (the "California UCC").

This opinion does not cover, and we express no opinion with respect to, perfection by methods other than the filing of a UCC-1 financing statement. Without limiting the generality of the foregoing, this opinion does not address perfection of security interests by control, including, without limitation, perfection by control of deposit accounts maintained by Borrower at First Basin National Bank, Account Nos. ending in -4271 and -8839, which requires the execution and delivery of deposit account control agreements under Section 9-104 of the California UCC, or perfection by possession of collateral under Section 9-313 of the California UCC.

We note that the priority of the security interests granted to the Collateral Agent in the collateral described in the Security Agreement is subject to the terms and conditions of the Intercreditor Agreement dated March 6, 2026, among Pinnacle (as Administrative Agent), Ridgeline Capital Partners LLC, and Borrower, acknowledged by Pacific Fiduciary (as Collateral Agent). Under the Intercreditor Agreement, Ridgeline retains a first-priority security interest in the Ridgeline Priority Collateral (consisting of specifically identified equipment, machinery, and related proceeds securing the existing $3,200,000 equipment financing under the Ridgeline Equipment Agreement), and the Collateral Agent holds a first-priority security interest in all other assets of the Borrower constituting Bridge Priority Collateral, including accounts receivable, inventory, general intangibles, intellectual property, and all other personal property not constituting Ridgeline Priority Collateral.

Opinion 4.12: Choice of Law

The Loan Agreement provides, in Section 10.09 thereof, that the Loan Agreement shall be governed by and construed in accordance with the laws of the State of California, without regard to conflicts-of-laws principles that would require the application of the laws of another jurisdiction. The selection of California law to govern the Loan Agreement is a valid and enforceable choice of law under California law, subject to customary qualifications regarding mandatory provisions of other jurisdictions that may be applicable notwithstanding such choice-of-law provision, and subject to the discretion of a court of competent jurisdiction to decline to apply California law if the court determines that California does not bear a reasonable relationship to the transaction or that application of California law would be contrary to a fundamental policy of another jurisdiction having a materially greater interest.

5. Qualifications and Limitations

5.1 Enforceability Qualifications

The enforceability opinion expressed in Section 4.6 above is subject to, qualified by, and limited by the following:

1. The effect of applicable bankruptcy, insolvency, reorganization, receivership, moratorium, arrangement, fraudulent transfer, fraudulent conveyance, preference, and other similar laws relating to or affecting the rights and remedies of creditors generally, including, without limitation, the Federal Bankruptcy Code (Title 11, United States Code), the California Uniform Voidable Transactions Act (California Civil Code §§ 3439 et seq.), and any successor statutes and all amendments thereto;

2. The effect of general principles of equity (regardless of whether enforcement is sought in a proceeding in equity or at law), including, without limitation, principles of commercial reasonableness, good faith, fair dealing, materiality, unconscionability, impracticability, impossibility of performance, and the discretion of the court before which any proceeding therefor may be brought, and the possible unavailability of specific performance, injunctive relief, or other equitable remedies;

3. The possible unenforceability of provisions of the Transaction Documents providing for indemnification, contribution, penalties, forfeitures, liquidated damages, or acceleration premiums to the extent that such provisions are deemed to constitute penalties or forfeitures, or to the extent that the amounts provided therein are deemed by a court of competent jurisdiction to be unreasonable or disproportionate to the actual damages suffered;

4. The possible unenforceability of provisions of the Transaction Documents purporting to waive or limit (a) the right to a trial by jury, (b) rights to receive notices required by law, (c) the benefit of applicable statutes of limitations, (d) the right to assert counterclaims or raise defenses, or (e) any other rights that cannot be waived or limited as a matter of applicable law or public policy;

5. Limitations on the enforceability of certain provisions of the Transaction Documents arising under, or otherwise subject to, considerations of public policy, including, without limitation, provisions relating to choice of forum, consent to jurisdiction, waiver of service of process, exculpation or limitation of liability, and broad releases of claims.

The foregoing qualifications are referred to herein collectively as the "Enforceability Qualifications."

5.2 Scope of Laws Covered

The opinions expressed herein are limited to the laws of the State of California and the federal laws of the United States of America, in each case as in effect on the date hereof, and we express no opinion as to the effect or applicability of the laws of any other jurisdiction. Except as expressly set forth in Opinion 4.1 (Due Organization and Good Standing — Delaware), we express no opinion as to the laws of the State of Delaware or any other state or foreign jurisdiction. With respect to our opinions on the valid existence and good standing of Borrower under the laws of the State of Delaware, we have relied exclusively upon (a) the certificate of good standing issued by the Secretary of State of the State of Delaware dated March 5, 2026, and (b) the Secretary's Certificate delivered by Miriam Sato, General Counsel and Secretary of Borrower, without any independent inquiry of the Secretary of State of the State of Delaware beyond our review of such certificate. We note that the General Corporation Law of the State of Delaware is applicable to the internal corporate affairs of Borrower, and we have not undertaken an independent analysis of Delaware corporate law in connection with this opinion. We express no opinion as to any matter governed by the laws of the State of New York or any other jurisdiction in which any Addressee may be organized or have its principal place of business.

5.3 Perfection Limitations

Our opinion regarding the perfection of security interests, as set forth in Opinion 4.11 above, is limited to security interests that may be perfected by the filing of a UCC-1 financing statement under Article 9 of the California UCC. Without limiting the generality of the foregoing, we express no opinion as to:

(a) the perfection of security interests in deposit accounts (as defined in Section 9-102(a)(29) of the California UCC), which requires perfection by control under Section 9-104 of the California UCC, including any deposit accounts maintained by Borrower at First Basin National Bank or any other depository institution;

(b) the perfection of security interests in letter-of-credit rights (as defined in Section 9-102(a)(51) of the California UCC), which also requires perfection by control;

(c) security interests in any property that is subject to a federal statute, regulation, or treaty that preempts Article 9 of the California UCC with respect to the filing or recording of security interests, or that otherwise provides a different mechanism for perfection;

(d) the priority of the security interests granted under the Security Agreement or the IP Security Agreement vis-à-vis any third-party liens, claims, or encumbrances (other than the relative lien priority established by the Intercreditor Agreement between the Secured Parties and Ridgeline Capital Partners LLC, as to which we have expressed no opinion regarding enforceability against third parties not party to such agreement); or

(e) the continuation, amendment, or termination of any UCC-1 financing statement, or the effect of any failure to timely file continuation statements under Section 9-515 of the California UCC.

With respect to intellectual property, the filing of the IP Security Agreement with the United States Patent and Trademark Office provides notice-filing perfection for registered patents, patent applications, and registered trademarks of the Borrower. However, perfection of security interests in unregistered intellectual property, trade secrets, copyrights (whether registered or unregistered), and domain names may require additional steps under applicable federal or state law, including, without limitation, recording with the United States Copyright Office, as to which we express no opinion.

5.4 No Opinion on Certain Matters

We express no opinion as to, and the opinions set forth herein do not address, any of the following matters:

(a) any tax matters, including, without limitation, federal, state, or local income tax, franchise tax, excise tax, sales tax, use tax, transfer tax, or documentary stamp tax consequences arising from or relating to the Transaction Documents or the transactions contemplated thereby;

(b) compliance with any federal or state securities laws, including, without limitation, the Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as amended, or the California Corporate Securities Law of 1968, as amended, with respect to the offer, issuance, or sale of shares of common stock of Borrower upon exercise of the Warrants or otherwise;

(c) any federal or state antitrust or competition laws, including, without limitation, the Sherman Antitrust Act, the Clayton Act, or the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended;

(d) any federal, state, or local environmental laws, rules, or regulations, including, without limitation, the Comprehensive Environmental Response, Compensation, and Liability Act, the Resource Conservation and Recovery Act, or any analogous state or local statutes;

(e) any federal or state pension, employee benefits, or labor laws, including, without limitation, the Employee Retirement Income Security Act of 1974, as amended ("ERISA"), and the regulations promulgated thereunder;

(f) the effect of any local (including county and municipal) ordinances, rules, regulations, or orders; and

(g) the laws of any foreign jurisdiction, including, without limitation, any foreign intellectual property laws, foreign regulatory requirements, or international treaties.

5.5 Lien Search Limitation

Our opinions are based, in part, upon the results of the UCC, federal tax lien, judgment lien, and intellectual property lien searches described in Section 2(9) above, which were conducted against Borrower and certain trade name variations in the State of Delaware, the State of California, and the United States Patent and Trademark Office on or about the date hereof. We express no opinion as to the completeness or accuracy of such search results, or as to filings, recordings, or other matters that may not yet be reflected in the applicable records or indices maintained by the relevant governmental offices due to delays in processing, indexing, or reporting. Furthermore, we express no opinion as to any liens, claims, or encumbrances that may have been filed or may have arisen after the date of such searches. The absence of any filing or recording reflected in such search results does not constitute an opinion or assurance that no such filing or recording exists or will be made.

6. Reliance and Other Matters

6.1 Reliance. This opinion letter is furnished solely for the benefit of the Addressees — namely, Pinnacle Venture Lending Corp., as Administrative Agent, Cobalt Life Sciences Fund III, L.P., as a Lender, and Pacific Fiduciary Services Inc., as Collateral Agent — and their respective successors and permitted assigns under the Transaction Documents, in each case solely in connection with the transactions contemplated by the Loan Agreement. This opinion letter may not be furnished to, disclosed to, quoted to, relied upon by, or used by any other person or entity, or for any other purpose, without our prior written consent in each instance. Notwithstanding the foregoing, this opinion letter may be disclosed to examiners, auditors, and regulators of the Addressees in connection with their supervisory and regulatory functions, provided that such examiners, auditors, and regulators shall not be entitled to rely upon this opinion letter.

6.2 No Obligation to Update

This opinion letter is rendered as of the date hereof and speaks only as of the date hereof. We undertake no obligation, and hereby disclaim any obligation, to update, revise, or supplement this opinion letter to reflect any facts or circumstances that may hereafter come to our attention, any changes in applicable law (whether by legislative action, judicial decision, administrative interpretation, or otherwise) that may hereafter occur, or any other events or developments of any kind occurring after the date hereof, even if any such facts, circumstances, changes, events, or developments would or might affect the opinions expressed herein.

6.3 California Bar Membership

The attorneys in this firm principally responsible for the preparation and issuance of this opinion letter are members of the State Bar of California. We express no opinion herein with respect to the laws of any jurisdiction other than the State of California and the federal laws of the United States of America, except as expressly set forth in Opinion 4.1 above with respect to the valid existence and good standing of Borrower under the laws of the State of Delaware.

Very truly yours,

CALDERWOOD & HARKNESS LLP

By: ________

Ian Blackwood, Partner Banking & Finance Group

555 California Street, 40th Floor San Francisco, California 94104 Telephone: (415) 773-6200

Email: iblackwood@calderwoodharkness.com

C&H Matter No. 14892.003

CALDERWOOD & HARKNESS LLP Attorneys at Law
555 California Street, 40th Floor San Francisco, California 94104 Telephone: (415) 773-6200 Facsimile: (415) 773-6201 www.calderwoodharkness.com
March 13, 2026
Pinnacle Venture Lending Corp., as Administrative Agent 2200 Sand Hill Road, Suite 400 Menlo Park, California 94025
Cobalt Life Sciences Fund III, L.P., as a Lender 600 Lexington Avenue, 22nd Floor New York, New York 10022
Pacific Fiduciary Services Inc., as Collateral Agent 350 Mission Street, Suite 1200 San Francisco, California 94105
Re: Bridge Loan Agreement dated March 6, 2026 (the "Loan Agreement") among Genome Dx Therapeutics Inc. (the "Borrower"), Pinnacle Venture Lending Corp. (as Administrative Agent and a Lender), Cobalt Life Sciences Fund III, L.P. (as a Lender), and Pacific Fiduciary Services Inc. (as Collateral Agent) — $15,000,000 Senior Secured Bridge Loan Facility
Ladies and Gentlemen:
We have acted as counsel to Genome Dx Therapeutics Inc., a corporation duly incorporated under the laws of the State of Delaware and qualified to transact business in the State of California (the "Borrower" or "GenomeDx"), in connection with the $15,000,000 Senior Secured Bridge Loan Facility (the "Facility") established pursuant to the Bridge Loan Agreement dated March 6, 2026 (the "Loan Agreement"), among the Borrower, Pinnacle Venture Lending Corp. ("Pinnacle"), as Administrative Agent and a Lender, Cobalt Life Sciences Fund III, L.P. ("Cobalt"), as a Lender, and Pacific Fiduciary Services Inc. ("Pacific Fiduciary"), as Collateral Agent for the benefit of the Secured Parties. This opinion letter is delivered to you pursuant to Section 4.01(f) of the Loan Agreement as a condition precedent to the initial funding under the Loan Agreement on the date hereof (the "Closing Date"). This opinion letter is addressed to Pinnacle, as Administrative Agent, Cobalt, as a Lender, and Pacific Fiduciary, as Collateral Agent (collectively, the "Addressees"). This matter is referenced internally as C&H Matter No. 14892.003.
1. Defined Terms and Transaction Documents
1.1 Defined Terms
Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Loan Agreement. As used herein, "Borrower" means Genome Dx Therapeutics Inc., a Delaware corporation; "Loan Agreement" means the Bridge Loan Agreement dated March 6, 2026; and "Transaction Documents" has the meaning given to such term in Section 1.2 below.
1.2 Enumeration of Transaction Documents
In rendering the opinions set forth herein, we have reviewed and are rendering opinions with respect to the following documents (collectively, the "Transaction Documents"):
1.  Bridge Loan Agreement dated March 6, 2026, among Borrower, Pinnacle Venture Lending Corp. (as Administrative Agent and a Lender), Cobalt Life Sciences Fund III, L.P. (as a Lender), and Pacific Fiduciary Services Inc. (as Collateral Agent), together with all schedules, exhibits, and annexes thereto (the "Loan Agreement");
2.  Security Agreement dated March 6, 2026, between Borrower (as Grantor) and Pacific Fiduciary Services Inc. (as Collateral Agent for the benefit of the Secured Parties), pursuant to which the Borrower has granted a security interest in substantially all of its personal property to secure the Obligations under the Loan Agreement (the "Security Agreement");
3.  intellectual Property Security Agreement dated March 6, 2026, between Borrower and Pacific Fiduciary Services Inc. (as Collateral Agent), in short form suitable for recording with the United States Patent and Trademark Office (the "USPTO"), covering certain registered patents, patent applications, and trademarks of the Borrower (the "IP Security Agreement");
4.  Common Stock Purchase Warrant dated March 6, 2026, issued by Borrower to Pinnacle Venture Lending Corp., for the purchase of 137,614 shares of common stock, par value $0.001 per share, of the Borrower (the "Pinnacle Warrant");
5.  Common Stock Purchase Warrant dated March 6, 2026, issued by Borrower to Cobalt Life Sciences Fund III, L.P., for the purchase of 68,807 shares of common stock, par value $0.001 per share, of the Borrower (the "Cobalt Warrant" and, together with the Pinnacle Warrant, the "Warrants"); and
6.  Intercreditor Agreement dated March 6, 2026, among Pinnacle Venture Lending Corp. (as Administrative Agent), Ridgeline Capital Partners LLC ("Ridgeline"), and Borrower, acknowledged by Pacific Fiduciary Services Inc. (as Collateral Agent), establishing the relative priorities of the security interests of the Secured Parties and Ridgeline in the assets of the Borrower (the "Intercreditor Agreement").
The Loan Agreement, Security Agreement, IP Security Agreement, the Warrants, and the Intercreditor Agreement are referred to herein collectively as the "Transaction Documents."
2. Documents and Items Examined
In rendering the opinions set forth herein, we have examined originals, or copies certified or otherwise identified to our satisfaction, of the following documents, certificates, instruments, and records:
1.  The Transaction Documents, each as executed and delivered by the parties thereto on or about March 6, 2026;
2.  The Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware on July 18, 2022, together with all certificates of amendment and certificates of designation filed therewith through the date hereof;
3.  The Bylaws of Borrower, as amended and restated effective September 12, 2023, together with all amendments thereto through the date hereof;
4.  Resolutions of the Board of Directors of Borrower, adopted by unanimous written consent on or about March 4, 2026, authorizing the execution, delivery, and performance of the Transaction Documents and the consummation of the transactions contemplated thereby, including the borrowing of up to $15,000,000 under the Loan Agreement, the grant of security interests in substantially all personal property of the Borrower, and the issuance of the Warrants;
5.  A certificate of good standing of Borrower issued by the Secretary of State of the State of Delaware, dated March 5, 2026, which date is within ten (10) days of the date hereof;
6.  A certificate of good standing (Certificate of Status — Foreign Corporation) of Borrower issued by the Secretary of State of the State of California, dated March 4, 2026, which date is within ten (10) days of the date hereof;
7.  A Secretary's Certificate of Borrower dated as of the date hereof, delivered by Miriam Sato, General Counsel and Secretary of the Borrower, certifying as to (a) the Amended and Restated Certificate of Incorporation and all amendments thereto, (b) the Bylaws as amended and restated, (c) the resolutions of the Board of Directors of Borrower authorizing the Transaction Documents, and (d) the incumbency and specimen signatures of the authorized officers of Borrower who executed the Transaction Documents, specifically Dr. Ananya Mehta, Chief Executive Officer, and Robert Langford, Chief Financial Officer (the "Secretary's Certificate");
8.  UCC-1 financing statements naming Borrower as debtor and Pacific Fiduciary Services Inc. as secured party, in the form to be filed with (a) the Secretary of State of the State of Delaware, as the jurisdiction of incorporation of Borrower, and (b) as a protective filing, with the Secretary of State of the State of California;
9.  The results of Uniform Commercial Code, federal tax lien, judgment lien, and intellectual property lien searches conducted against Borrower (and certain trade name variations) in (a) the State of Delaware (Office of the Secretary of State), (b) the State of California (Office of the Secretary of State), and (c) the United States Patent and Trademark Office, each such search dated on or about the date hereof and delivered by Granite Harbor Health IT, Inc.;
10.  The existing Equipment Financing Agreement dated December 15, 2023, between Borrower and Ridgeline Capital Partners LLC, with an outstanding principal balance of approximately $3,200,000 as of the date hereof, maturing in December 2027 (the "Ridgeline Equipment Agreement"); and
11.  Such other documents, certificates, records, and instruments as we have deemed necessary or appropriate for purposes of this opinion, including records of proceedings and actions of the Board of Directors of Borrower made available to us.
In our examination of the foregoing documents and other materials, we have assumed, and have not independently verified, the completeness of the indices and filing records maintained by the governmental offices where we have conducted or caused to be conducted our searches. We have also made such inquiries of officers and representatives of the Borrower as we have considered relevant.
3. Assumptions
In rendering the opinions expressed herein, we have assumed, without independent investigation or verification, the following:
1.  The genuineness of all signatures (other than the signatures of authorized officers of Borrower), the authenticity of all seals, and the competency of all persons executing documents on behalf of parties other than Borrower;
2.  The authenticity and completeness of all documents submitted to us as originals, and the conformity to authentic originals of all documents submitted to us as copies, whether certified, photostatic, electronic, or otherwise;
3.  The legal capacity of all natural persons who have executed or delivered any of the documents examined by us;
4.  That each party to the Transaction Documents (other than Borrower) is duly organized, validly existing, and in good standing under the laws of its respective jurisdiction of organization, and has all requisite organizational power and authority to conduct its business as presently conducted;
5.  That each party to the Transaction Documents (other than Borrower) has all requisite power and authority, and has taken all necessary organizational action, to execute, deliver, and perform its respective obligations under the Transaction Documents to which it is a party;
6.  That the Transaction Documents have been duly authorized, executed, and delivered by each party thereto (other than Borrower), and constitute the legal, valid, and binding obligations of each such party, enforceable against each such party in accordance with their respective terms;
7.  That the representations and warranties of Borrower set forth in the Transaction Documents and in the Secretary's Certificate are true, correct, and complete in all material respects as of the date hereof, and that no event has occurred since the date of such representations and warranties that would render any of them untrue, incorrect, or incomplete;
8.  That the execution and delivery of the Transaction Documents by Borrower and the consummation of the transactions contemplated thereby will not violate any order, judgment, decree, or injunction of any court or other governmental authority binding on Borrower, except to the extent expressly opined upon in Section 4 below;
9.  That the UCC-1 financing statements described in Section 2(8) above will be properly filed in the offices indicated therein and will contain the information required for effectiveness under applicable provisions of the Uniform Commercial Code, including the correct legal name of the Borrower as debtor and an adequate description of the collateral; and
10.  That Pacific Fiduciary Services Inc., as Collateral Agent for the benefit of the Secured Parties, has given "value" within the meaning of Sections 1-204 and 9-203 of the Uniform Commercial Code, and that the other conditions to attachment of the security interests contemplated by the Security Agreement and the IP Security Agreement, other than those upon which we are opining herein, have been satisfied.
We have made no independent investigation of the factual matters set forth in the foregoing assumptions. To the extent that any of the foregoing assumptions proves to be incorrect, the opinions expressed herein may be adversely affected.
4. Opinions
Based upon and subject to the foregoing, and subject further to the qualifications and limitations set forth in Section 5 below, we are of the opinion that:
Opinion 4.1: Due Organization and Good Standing (Delaware)
The Borrower is a corporation duly incorporated, validly existing, and in good standing under the laws of the State of Delaware. In rendering this opinion, we have reviewed (a) the Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware (including all certificates of amendment and certificates of designation thereto), (b) the certificate of good standing of Borrower issued by the Secretary of State of the State of Delaware dated March 5, 2026, and (c) the Secretary's Certificate delivered by Miriam Sato. The Borrower's Delaware file number is 7481263. We note that our opinion with respect to the valid existence and good standing of Borrower under the laws of the State of Delaware is based solely on the certificate of good standing and the Secretary's Certificate referred to above, and we have not made any independent inquiry of the Secretary of State of the State of Delaware beyond our review of such certificate.
Opinion 4.2: Qualification and Good Standing (California)
The Borrower is duly qualified to transact business and is in good standing as a foreign corporation in the State of California. In rendering this opinion, we have reviewed the certificate of good standing (Certificate of Status — Foreign Corporation) issued by the Secretary of State of the State of California, dated March 4, 2026, and we have relied upon such certificate without independent investigation. We express no opinion as to the qualification of Borrower to transact business in any jurisdiction other than the State of California.
Opinion 4.3: Corporate Power and Authority
The Borrower has the corporate power and authority to (a) own, lease, and operate its properties and assets, (b) carry on its business as presently conducted, and (c) execute, deliver, and perform its obligations under each of the Transaction Documents, including the Loan Agreement, the Security Agreement, the IP Security Agreement, the Pinnacle Warrant, the Cobalt Warrant, and the Intercreditor Agreement, and to consummate the transactions contemplated thereby. Without limiting the generality of the foregoing, the Borrower has the corporate power and authority to borrow up to $15,000,000 under the Loan Agreement, to grant the security interests in substantially all of its personal property as contemplated by the Security Agreement and the IP Security Agreement, to issue the Warrants covering an aggregate of 206,421 shares of common stock (137,614 shares issuable under the Pinnacle Warrant and 68,807 shares issuable under the Cobalt Warrant), and to enter into the lien priority arrangements set forth in the Intercreditor Agreement with Ridgeline Capital Partners LLC. The Amended and Restated Certificate of Incorporation of Borrower authorizes the issuance of a sufficient number of shares of common stock to permit the exercise in full of each of the Warrants.
Opinion 4.4: Due Authorization
The execution, delivery, and performance by Borrower of each of the Transaction Documents, and the consummation by Borrower of the transactions contemplated thereby (including the borrowing of up to $15,000,000, the granting of the security interests described therein, and the issuance of the Warrants), have been duly authorized by all necessary corporate action on the part of Borrower, including resolutions of the Board of Directors of Borrower adopted by unanimous written consent on or about March 4, 2026. No stockholder approval is required under the Amended and Restated Certificate of Incorporation, the Bylaws, or the General Corporation Law of the State of Delaware for the execution, delivery, and performance of the Transaction Documents. In rendering this opinion, we have reviewed the Board resolutions and the Secretary's Certificate delivered by Miriam Sato, General Counsel and Secretary of Borrower, certifying the adoption, completeness, and continuing effectiveness of such resolutions as of the date hereof.
Opinion 4.5: Execution and Delivery
Each of the Transaction Documents has been duly executed and delivered by Borrower. The Loan Agreement, the Security Agreement, the IP Security Agreement, the Pinnacle Warrant, the Cobalt Warrant, and the Intercreditor Agreement were executed by authorized officers of Borrower, specifically Dr. Ananya Mehta, Chief Executive Officer, and/or Robert Langford, Chief Financial Officer, as certified in the incumbency certificates and specimen signatures attached to the Secretary's Certificate. We have compared the signatures appearing on the executed Transaction Documents with the specimen signatures included in the Secretary's Certificate and have confirmed their conformity.
Opinion 4.6: Enforceability
Each of the Transaction Documents constitutes the legal, valid, and binding obligation of Borrower, enforceable against Borrower in accordance with its respective terms. The foregoing opinion is subject to the Enforceability Qualifications set forth in Section 5.1 below.
Opinion 4.7: No Violation — Charter and Bylaws
The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not (a) violate, contravene, or conflict with the Amended and Restated Certificate of Incorporation of Borrower, as filed with the Secretary of State of the State of Delaware (including all certificates of amendment and certificates of designation thereto), or (b) violate, contravene, or conflict with the Bylaws of Borrower, as amended and restated.
Opinion 4.8: No Violation — Material Agreements
The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not result in a breach of, constitute a default (or an event that, with the giving of notice or the passage of time, or both, would constitute a default) under, result in the acceleration of, create in any party the right to accelerate, terminate, modify, or cancel, or require any notice or consent under, any material agreement or instrument to which Borrower is a party or by which Borrower or any of its properties or assets are bound, to the extent such agreements and instruments have been identified to us by Borrower. This opinion is limited to the agreements and instruments listed on the schedule of material agreements provided to us by Borrower in connection with this transaction, which includes, among other items, the existing Equipment Financing Agreement dated December 15, 2023, between Borrower and Ridgeline Capital Partners LLC. We note that the Intercreditor Agreement addresses the relative priority of liens under the Ridgeline Equipment Agreement and the Transaction Documents, and we have confirmed that the execution and delivery of the Transaction Documents and the grant of the security interests thereunder are not prohibited by the terms of the Ridgeline Equipment Agreement, as modified by the Intercreditor Agreement. We have not, however, undertaken any independent investigation to determine whether there exist agreements or instruments to which Borrower is a party or by which Borrower is bound that were not identified to us.
Opinion 4.9: No Violation — Applicable Law
The execution, delivery, and performance by Borrower of the Transaction Documents, and the consummation of the transactions contemplated thereby, do not and will not violate any applicable law, statute, rule, or regulation of the State of California or the federal laws of the United States, in each case as currently in effect on the date hereof. This opinion is limited to the laws of the State of California and the federal laws of the United States that, in our experience, are normally applicable to transactions of the type contemplated by the Transaction Documents. We express no opinion as to the laws of any other jurisdiction, including the General Corporation Law of the State of Delaware, as to which we have relied on the assumptions and qualifications set forth herein and on the opinions of Delaware counsel, if any, delivered in connection with this transaction.
Opinion 4.10: Governmental Approvals
No consent, approval, authorization, license, permit, or order of, or filing, registration, or qualification with, any California state or federal governmental authority or regulatory body is required for the execution, delivery, or performance by Borrower of the Transaction Documents or the consummation of the transactions contemplated thereby, other than:
(a) the filing of UCC-1 financing statements with the Secretary of State of the State of Delaware and the Secretary of State of the State of California, as described in Section 2(8) above;
(b) the recording of the IP Security Agreement with the United States Patent and Trademark Office; and
(c) such consents, approvals, authorizations, orders, filings, registrations, and qualifications as have already been obtained or made and are in full force and effect as of the date hereof.
Opinion 4.11: Perfection of Security Interests (UCC)
Upon the filing of the UCC-1 financing statements, in the form examined by us, with the Secretary of State of the State of Delaware (as the jurisdiction in which Borrower is incorporated and organized) and, as a protective filing, with the Secretary of State of the State of California, the Collateral Agent will have a perfected security interest, for the benefit of the Secured Parties, in all right, title, and interest of Borrower in and to the personal property of Borrower described in the Security Agreement to the extent that a security interest therein may be perfected by the filing of a UCC-1 financing statement under Article 9 of the California Uniform Commercial Code (the "California UCC").
This opinion does not cover, and we express no opinion with respect to, perfection by methods other than the filing of a UCC-1 financing statement. Without limiting the generality of the foregoing, this opinion does not address perfection of security interests by control, including, without limitation, perfection by control of deposit accounts maintained by Borrower at First Basin National Bank, Account Nos. ending in -4271 and -8839, which requires the execution and delivery of deposit account control agreements under Section 9-104 of the California UCC, or perfection by possession of collateral under Section 9-313 of the California UCC.
We note that the priority of the security interests granted to the Collateral Agent in the collateral described in the Security Agreement is subject to the terms and conditions of the Intercreditor Agreement dated March 6, 2026, among Pinnacle (as Administrative Agent), Ridgeline Capital Partners LLC, and Borrower, acknowledged by Pacific Fiduciary (as Collateral Agent). Under the Intercreditor Agreement, Ridgeline retains a first-priority security interest in the Ridgeline Priority Collateral (consisting of specifically identified equipment, machinery, and related proceeds securing the existing $3,200,000 equipment financing under the Ridgeline Equipment Agreement), and the Collateral Agent holds a first-priority security interest in all other assets of the Borrower constituting Bridge Priority Collateral, including accounts receivable, inventory, general intangibles, intellectual property, and all other personal property not constituting Ridgeline Priority Collateral.
Opinion 4.12: Choice of Law
The Loan Agreement provides, in Section 10.09 thereof, that the Loan Agreement shall be governed by and construed in accordance with the laws of the State of California, without regard to conflicts-of-laws principles that would require the application of the laws of another jurisdiction. The selection of California law to govern the Loan Agreement is a valid and enforceable choice of law under California law, subject to customary qualifications regarding mandatory provisions of other jurisdictions that may be applicable notwithstanding such choice-of-law provision, and subject to the discretion of a court of competent jurisdiction to decline to apply California law if the court determines that California does not bear a reasonable relationship to the transaction or that application of California law would be contrary to a fundamental policy of another jurisdiction having a materially greater interest.
5. Qualifications and Limitations
5.1 Enforceability Qualifications
The enforceability opinion expressed in Section 4.6 above is subject to, qualified by, and limited by the following:
1.  The effect of applicable bankruptcy, insolvency, reorganization, receivership, moratorium, arrangement, fraudulent transfer, fraudulent conveyance, preference, and other similar laws relating to or affecting the rights and remedies of creditors generally, including, without limitation, the Federal Bankruptcy Code (Title 11, United States Code), the California Uniform Voidable Transactions Act (California Civil Code §§ 3439 et seq.), and any successor statutes and all amendments thereto;
2.  The effect of general principles of equity (regardless of whether enforcement is sought in a proceeding in equity or at law), including, without limitation, principles of commercial reasonableness, good faith, fair dealing, materiality, unconscionability, impracticability, impossibility of performance, and the discretion of the court before which any proceeding therefor may be brought, and the possible unavailability of specific performance, injunctive relief, or other equitable remedies;
3.  The possible unenforceability of provisions of the Transaction Documents providing for indemnification, contribution, penalties, forfeitures, liquidated damages, or acceleration premiums to the extent that such provisions are deemed to constitute penalties or forfeitures, or to the extent that the amounts provided therein are deemed by a court of competent jurisdiction to be unreasonable or disproportionate to the actual damages suffered;
4.  The possible unenforceability of provisions of the Transaction Documents purporting to waive or limit (a) the right to a trial by jury, (b) rights to receive notices required by law, (c) the benefit of applicable statutes of limitations, (d) the right to assert counterclaims or raise defenses, or (e) any other rights that cannot be waived or limited as a matter of applicable law or public policy;
5.  Limitations on the enforceability of certain provisions of the Transaction Documents arising under, or otherwise subject to, considerations of public policy, including, without limitation, provisions relating to choice of forum, consent to jurisdiction, waiver of service of process, exculpation or limitation of liability, and broad releases of claims.
The foregoing qualifications are referred to herein collectively as the "Enforceability Qualifications."
5.2 Scope of Laws Covered
The opinions expressed herein are limited to the laws of the State of California and the federal laws of the United States of America, in each case as in effect on the date hereof, and we express no opinion as to the effect or applicability of the laws of any other jurisdiction. Except as expressly set forth in Opinion 4.1 (Due Organization and Good Standing — Delaware), we express no opinion as to the laws of the State of Delaware or any other state or foreign jurisdiction. With respect to our opinions on the valid existence and good standing of Borrower under the laws of the State of Delaware, we have relied exclusively upon (a) the certificate of good standing issued by the Secretary of State of the State of Delaware dated March 5, 2026, and (b) the Secretary's Certificate delivered by Miriam Sato, General Counsel and Secretary of Borrower, without any independent inquiry of the Secretary of State of the State of Delaware beyond our review of such certificate. We note that the General Corporation Law of the State of Delaware is applicable to the internal corporate affairs of Borrower, and we have not undertaken an independent analysis of Delaware corporate law in connection with this opinion. We express no opinion as to any matter governed by the laws of the State of New York or any other jurisdiction in which any Addressee may be organized or have its principal place of business.
5.3 Perfection Limitations
Our opinion regarding the perfection of security interests, as set forth in Opinion 4.11 above, is limited to security interests that may be perfected by the filing of a UCC-1 financing statement under Article 9 of the California UCC. Without limiting the generality of the foregoing, we express no opinion as to:
(a) the perfection of security interests in deposit accounts (as defined in Section 9-102(a)(29) of the California UCC), which requires perfection by control under Section 9-104 of the California UCC, including any deposit accounts maintained by Borrower at First Basin National Bank or any other depository institution;
(b) the perfection of security interests in letter-of-credit rights (as defined in Section 9-102(a)(51) of the California UCC), which also requires perfection by control;
(c) security interests in any property that is subject to a federal statute, regulation, or treaty that preempts Article 9 of the California UCC with respect to the filing or recording of security interests, or that otherwise provides a different mechanism for perfection;
(d) the priority of the security interests granted under the Security Agreement or the IP Security Agreement vis-à-vis any third-party liens, claims, or encumbrances (other than the relative lien priority established by the Intercreditor Agreement between the Secured Parties and Ridgeline Capital Partners LLC, as to which we have expressed no opinion regarding enforceability against third parties not party to such agreement); or
(e) the continuation, amendment, or termination of any UCC-1 financing statement, or the effect of any failure to timely file continuation statements under Section 9-515 of the California UCC.
With respect to intellectual property, the filing of the IP Security Agreement with the United States Patent and Trademark Office provides notice-filing perfection for registered patents, patent applications, and registered trademarks of the Borrower. However, perfection of security interests in unregistered intellectual property, trade secrets, copyrights (whether registered or unregistered), and domain names may require additional steps under applicable federal or state law, including, without limitation, recording with the United States Copyright Office, as to which we express no opinion.
5.4 No Opinion on Certain Matters
We express no opinion as to, and the opinions set forth herein do not address, any of the following matters:
(a) any tax matters, including, without limitation, federal, state, or local income tax, franchise tax, excise tax, sales tax, use tax, transfer tax, or documentary stamp tax consequences arising from or relating to the Transaction Documents or the transactions contemplated thereby;
(b) compliance with any federal or state securities laws, including, without limitation, the Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as amended, or the California Corporate Securities Law of 1968, as amended, with respect to the offer, issuance, or sale of shares of common stock of Borrower upon exercise of the Warrants or otherwise;
(c) any federal or state antitrust or competition laws, including, without limitation, the Sherman Antitrust Act, the Clayton Act, or the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended;
(d) any federal, state, or local environmental laws, rules, or regulations, including, without limitation, the Comprehensive Environmental Response, Compensation, and Liability Act, the Resource Conservation and Recovery Act, or any analogous state or local statutes;
(e) any federal or state pension, employee benefits, or labor laws, including, without limitation, the Employee Retirement Income Security Act of 1974, as amended ("ERISA"), and the regulations promulgated thereunder;
(f) the effect of any local (including county and municipal) ordinances, rules, regulations, or orders; and
(g) the laws of any foreign jurisdiction, including, without limitation, any foreign intellectual property laws, foreign regulatory requirements, or international treaties.
5.5 Lien Search Limitation
Our opinions are based, in part, upon the results of the UCC, federal tax lien, judgment lien, and intellectual property lien searches described in Section 2(9) above, which were conducted against Borrower and certain trade name variations in the State of Delaware, the State of California, and the United States Patent and Trademark Office on or about the date hereof. We express no opinion as to the completeness or accuracy of such search results, or as to filings, recordings, or other matters that may not yet be reflected in the applicable records or indices maintained by the relevant governmental offices due to delays in processing, indexing, or reporting. Furthermore, we express no opinion as to any liens, claims, or encumbrances that may have been filed or may have arisen after the date of such searches. The absence of any filing or recording reflected in such search results does not constitute an opinion or assurance that no such filing or recording exists or will be made.
6. Reliance and Other Matters
6.1 Reliance.  This opinion letter is furnished solely for the benefit of the Addressees — namely, Pinnacle Venture Lending Corp., as Administrative Agent, Cobalt Life Sciences Fund III, L.P., as a Lender, and Pacific Fiduciary Services Inc., as Collateral Agent — and their respective successors and permitted assigns under the Transaction Documents, in each case solely in connection with the transactions contemplated by the Loan Agreement. This opinion letter may not be furnished to, disclosed to, quoted to, relied upon by, or used by any other person or entity, or for any other purpose, without our prior written consent in each instance. Notwithstanding the foregoing, this opinion letter may be disclosed to examiners, auditors, and regulators of the Addressees in connection with their supervisory and regulatory functions, provided that such examiners, auditors, and regulators shall not be entitled to rely upon this opinion letter.
6.2 No Obligation to Update
This opinion letter is rendered as of the date hereof and speaks only as of the date hereof. We undertake no obligation, and hereby disclaim any obligation, to update, revise, or supplement this opinion letter to reflect any facts or circumstances that may hereafter come to our attention, any changes in applicable law (whether by legislative action, judicial decision, administrative interpretation, or otherwise) that may hereafter occur, or any other events or developments of any kind occurring after the date hereof, even if any such facts, circumstances, changes, events, or developments would or might affect the opinions expressed herein.
6.3 California Bar Membership
The attorneys in this firm principally responsible for the preparation and issuance of this opinion letter are members of the State Bar of California. We express no opinion herein with respect to the laws of any jurisdiction other than the State of California and the federal laws of the United States of America, except as expressly set forth in Opinion 4.1 above with respect to the valid existence and good standing of Borrower under the laws of the State of Delaware.
Very truly yours,
CALDERWOOD & HARKNESS LLP
By: ________
Ian Blackwood, Partner Banking & Finance Group
555 California Street, 40th Floor San Francisco, California 94104 Telephone: (415) 773-6200
Email: iblackwood@calderwoodharkness.com
C&H Matter No. 14892.003

CALDERWOOD & HARKNESS LLP Attorneys at Law

CALDERWOOD & HARKNESS LLP

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