This excerpt taken from the ZGEN 10-K filed Mar 14, 2005.
The Board may amend the provisions contained herein in such respects as it deems advisable. Any such amendment shall not, without the consent of the Eligible Director, impair or diminish any rights of an Eligible Director or any rights of the Company under an Option.
Provisions of the Plan (including any amendments) that were not discussed above, to the extent applicable to Eligible Directors shall continue to govern the terms and conditions of Options granted to Eligible Directors.
As amended and restated on September 16, 2004.