This excerpt taken from the TPTX 10-K filed Mar 29, 2007.
9. NON-TRANSFERABILITY. Your Award is not transferable, except by will or by the laws of descent and distribution. Notwithstanding the foregoing, by delivering written notice to the Company, in a form satisfactory to the Company, you may designate a third party who, in the event of your death, will thereafter be entitled to receive any distribution of shares of Common Stock pursuant to Section 1 of this Agreement.