ZymoGenetics, Inc. to Webcast Presentation at Two Upcoming Conferences

SEATTLE, Sept. 6 /PRNewswire-FirstCall/ -- ZymoGenetics, Inc. announced today that Douglas E. Williams, Ph.D., President and Chief Scientific Officer, will provide an overview of company activities at the Bear Stearns Annual Healthcare Conference on September 10, 2007 at 8:00 a.m. Eastern Time and at the UBS Global Life Sciences Conference on September 24, 2007 at 12:30 p.m. Eastern Time.

Live webcasts of both presentations can be accessed by going to: http://www.zymogenetics.com. The webcasts will be archived for 30 days.

About ZymoGenetics

ZymoGenetics creates novel protein drugs with the potential to significantly help patients fight their diseases. The Company is developing a diverse pipeline of proprietary product candidates that are moving into and through clinical development. These candidates span a wide array of clinical opportunities that include bleeding, autoimmune and viral diseases and cancer. ZymoGenetics intends to commercialize these product candidates through internal development, collaborations with partners, and out-licensing of patents from its extensive patent portfolio. For further information, visit http://www.zymogenetics.com.

This press release contains “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on the current intent and expectations of the management of ZymoGenetics. These statements are not guarantees of future performance and involve risks and uncertainties that are difficult to predict. ZymoGenetics’ actual results and the timing and outcome of events may differ materially from those expressed in or implied by the forward-looking statements because of risks associated with our unproven discovery strategy, preclinical and clinical development, regulatory oversight, intellectual property claims and litigation and other risks detailed in the company’s public filings with the Securities and Exchange Commission, including the company’s Annual Report on Form 10-K for the year ended December 31, 2006. Except as required by law, ZymoGenetics undertakes no obligation to update any forward-looking or other statements in this press release, whether as a result of new information, future events or otherwise.

Investor & Media Relations Susan W. Specht, MBA Associate Director, Corporate Communications (206) 442-6592

ZymoGenetics, Inc.

CONTACT: Investor & Media Relations, Susan W. Specht, MBA, AssociateDirector, Corporate Communications of ZymoGenetics, Inc., +1-206-442-6592

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