system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
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subject matter of this Agreement. 14. Amendment. This Agreement may be amended or modified only by a written instrument executed by both the Company and the Consultant. 15. Non-Assignability of Contract. This Agreement is personal to the Consultant and the Consultant shall not have the right to assign any of Consultant's rights or delegate any of Consultant's duties without the express written consent of the Company. Any non-consented-to assignment or delegation, whether express or implied or by operation of law, shall be void and shall constitute a breach and a default by the Consultant. - 6 - 16. Governing Law. This Agreement shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts without giving effect to any choice or conflict of law provision or rule that would cause the application of laws of any other jurisdiction. 17. Successors and Assigns. This Agreement shall be binding upon, and inure to the benefit of, both parties and their respective successors and assigns, including any corporation with which, or into which, the Company may be merged or which may succeed to its assets or business, provided, however, that the obligations of the Consultant are personal and shall not be assigned by Consultant. 18. Interpretation. If any restriction set forth in Section 1, 6 or 7 is found by any court of competent jurisdiction to be unenforceable because it extends for too long a period of time or over too great a range of activities or in too broad a geographic area, it shall be interpreted to extend only over the maximum period of time, range of activities or geographic area as to which it may be enforceable. 19. Survival. The last sentence of Section 1 and Sections 4 through 20 shall survive the expiration or termination of this Agreement. 20. Miscellaneous. 20.1 No delay or omission by the Company in exercising any right under this Agreement shall operate as a waiver of that or any other right. A waiver or consent given by the Company on any one occasion shall be effective only in that instance and shall not be construed as a bar or waiver of any right on any other occasion. 20.2 The captions of the sections of this Agreement are for convenience of reference only and in no way define, limit or affect the scope or substance of any section of this Agreement. 20.3 In the event that any provision of this Agreement shall be invalid, illegal or otherwise unenforceable, the validity, legality and enforceability of the remaining provisions shall in no way be affected or impaired thereby. [Remainder of Page Intentionally Left Blank] - 7 - IN WITNESS WHEREOF, the parties hereto have executed this Consulting Agreement as of the date and year first above written. COMPANY: IMMUNOTOLERANCE, INC. By: /s/ Dan Matloff Name: Dan Matloff Title: CFO CONSULTANT: /s/ Alan Crane Name: Alan Crane SIGNATURE PAGE TO CONSULTING AGREEMENT SCHEDULE A Consultant will provide advice and services to the Company as requested by the Board of Directors from time to time. The field for purposes of Section 1 is defined as drugs and cell-based therapies designed for tissue-specific immunosuppression.
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Extract the exact clause related to "Expiration Date" from the excerpt above.