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:
"""
Exhibit 10.11 DATED 26 September 2019 BicycleTX Ltd and Nigel Crockett ___________________________________________________ SERVICE AGREEMENT ___________________________________________________ THIS AGREEMENT is made on 26 September 2019 BETWEEN: (1) BICYCLETX LIMITED a company incorporated under the laws of England and Wales (Company Number 11036101) whose registered office is at Building 900 Babraham Research Campus, Babraham, Cambridgeshire, CB22 3AT, United Kingdom (the "Company"); and (2) NIGEL CROCKETT of (the ''Employee"). IT IS AGREED as follows: 1. COMMENCEMENT OF EMPLOYMENT 1.1 This Agreement shall take effect 26 September 2019 (the "Effective Date"). 1.2 Your employment shall commence on 26 September 2019 and shall continue unless and until either party gives notice to the other in accordance with paragraph 11 below. No employment with a previous employer is deemed to be continuous with your employment with the Company. 1.3 You warrant that by entering into this Agreement or any other arrangements with the Company you will not be in breach of or subject to any express or implied terms of any contract with, or other obligation to, any third party binding on you, including, without limitation, any notice period or the provisions of any restrictive covenants or confidentiality obligations arising out of any employment with any other employer or former employer. 1.4 You warrant that you have the right to work in the United Kingdom and you agree to provide to the Company copies of all relevant documents in this respect at the request of the Company. If at any time during the course of this Agreement you cease to have the right to work in the United Kingdom the Company may immediately terminate your employment without payment of compensation. 2. JOB TITLE 2.1 You shall serve as Chief Business Officer ("CBO") reporting to the CEO. The nature of the Company's business may result in changes occurring to the content of your role from time to time. You may also be required to carry out such additional or alternative tasks as may from time to time be reasonably required of you consistent with your executive level and job title, provided that these do not fundamentally change or undermine your position. 2.2 You shall faithfully and diligently perform such duties as you are required to undertake from time to time and exclusively devote the whole of your working time, skills, ability and attention to the business of the Company and use your best endeavours to promote the interests and reputation of the Company and (where applicable) any Group Company. 2.3 The Company may require you to carry out work for, or become a director or officer of, any Group Company at any time. 3. PLACE OF WORK The Company's offices at Building 900, Babraham Research Campus, Babraham, Cambridge, 1 th th UK or such other location as the Company may reasonably determine. The CBO position may require extensive international travel on business. 4. REMUNERATION 4.1 Your salary will be USD370,000 per annum paid monthly in arrears on or about the last working day of each month (less statutory and voluntary deductions) ("Salary"). Salary will be converted to GBP and paid in GBP based on the USD/GBP Bank of England daily spot exchange rate applicable on the date of this Agreement, with the exchange rate being revised according to the prevailing Bank of England daily spot exchange rate applicable on 1 January of each year. Your Salary will be reviewed annually in accordance with the Company's practices from time to time (which is expected to be by the end of the first quarter of each year). You will be notified in writing of any changes to your Salary or benefits. 4.2 You agree that the Company may deduct from the Salary or any other sum due to you (including any pay in lieu of notice) any amounts due to the Company including, without limitation, any overpayment of salary, loan or advance. 4.3 For the purposes of this Agreement your earned salary shall mean the proportion of your Salary earned by and due to you in each calendar year of employment with the Company ("Earned Salary"). 4.4 Annual Performance Bonuses: You will be eligible to participate in the Company's discretionary annual performance related bonus scheme to a maximum value of 35% of your Earned Salary in relation to your performance against agreed annual corporate and personal performance objectives as set out below (the "Annual Performance Bonus"). That is, if the compensation committee (the "Compensation Committee") of the board of directors (the "Board") of the Company's parent company, Bicycle Therapeutics plc
"""

Extract the exact clause related to "Expiration Date" from the excerpt above.

assistant: Your employment shall commence on 26 September 2019 and shall continue unless and until either party gives notice to the other in accordance with paragraph 11 below.