A further list and description of risks and uncertainties can be found in Pfizer's Annual Report on Form 10-K for the fiscal year ended December 31, 2006 and in its reports on Form 10-Q and Form 8-K. Important Additional Information: The tender offer described herein has not commenced. The description contained herein is neither an offer to purchase nor a solicitation of an offer to sell shares of Coley. At the time the tender offer is commenced, Corvette Acquisition Corp. and Pfizer intend to file a Tender Offer Statement on Schedule TO containing an offer to purchase, forms of letters of transmittal and other documents relating to the tender offer and Coley intends to file a Solicitation/Recommendation Statement on Schedule 14D-9 with respect to the tender offer. Pfizer and Coley intend to mail these documents to the stockholders of Coley. These documents will contain important information about the tender offer and stockholders of Coley are urged to read them carefully when they become available.