STOCK OPTION AGREEMENT
(CHAIRMAN OF BOARD OF DIRECTORS STOCK OPTION)
THIS STOCK OPTION AGREEMENT (this "Agreement"), effective as of ______________ (the "Grant
Date"), is by and between LEXICON GENETICS INCORPORATED, a Delaware corporation (the
"Company"), and ______________ ("Optionee").
To carry out the purposes of the Lexicon Genetics Incorporated 2000 Equity Incentive Plan (the "Plan"), by
providing Optionee the opportunity to purchase shares of Common Stock, par value $0.001 per share, of the
Company ("Stock"), and in consideration of the mutual agreements and other matters set forth herein and in the
Plan, the Company and Optionee hereby agree as follows:
1. Grant of Option. The Company hereby grants to Optionee the right and option (the "Option") to purchase all
or any part of an aggregate of ___________ shares of Stock, on the terms and conditions set forth in this
Agreement and in the Plan. The Option shall be treated as a non-statutory stock option and not as an "incentive
stock option" within the meaning of section 422(b) of the Internal Revenue Code of 1986, as amended (the
2. Exercise Price. The price at which Optionee may purchase Stock upon exercise of the Option (the "Exercise
Price") shall be $_________ per share, which has been determined to be the Fair Market Value (as defined in
the Plan) of the Stock on the Grant Date. The Exercise Price is subject to adjustment under certain circumstances
as provided in the Plan.
3. Term. The Option shall expire on the 10th anniversary of the Grant Date, subject to earlier termination under
the circumstances specified in Section 8 of this Agreement.
4. Exercisability and Vesting. (a) Subject to the terms and conditions set forth in this Agreement and the Plan, the
Option may be exercised, in whole or in part, at any time and from time to time during the term of the Option, to
purchase the number of shares of Stock that have vested and become exercisable in accordance with this
Agreement. The Option shall