Maxygen, Inc. First Quarter 2007 Financial Results Conference Call Notice

REDWOOD CITY, Calif., April 25 /PRNewswire-FirstCall/ -- Maxygen, Inc. will host a conference call to discuss the company’s first quarter 2007 financial results at 11:30 a.m. ET (8:30 a.m. PT) on Tuesday, May 8, 2007. Russell Howard, Maxygen’s chief executive officer, will host the call. A press release announcing Maxygen’s first quarter 2006 financial results will be issued that same day at approximately 9:00 a.m. ET (6:00 a.m. PT).

The call will include discussion of non-GAAP financial measures. Reconciliation of the non-GAAP financial measures to the most directly applicable GAAP measures can be found at www.maxygen.com under the “News” tab.

Participants in the U.S. can access the call by dialing 866.383.8119 and using the passcode 93255376. International participants can dial 617.597.5344 and use the same passcode. A live webcast of the conference call will be available in the “Investors” section of the Maxygen web site at www.maxygen.com.

Telephone and webcast replays of the conference call will be available until June 8, 2007. To access the telephone replay, dial 888.286.8010 (U.S.) or 617.801.6888 (international) and use the passcode 67649116. The webcast archive will be available in the “Investors” section of the Maxygen website at www.maxygen.com.

About Maxygen

Maxygen is a biopharmaceutical company focused on developing improved versions of protein drugs. We look for opportunities where our proprietary protein modification technologies can address significant therapeutic needs. Products developed by Maxygen now in clinical trials include a novel interferon-alpha for the treatment of hepatitis C virus (HCV) infection and a novel G-CSF for the treatment of neutropenia. Maxygen’s approach may allow us to leverage the established development and regulatory paths of approved drugs. We believe this advantage translates to a greater chance of successfully bringing important new drugs to market. www.maxygen.com

Maxygen, Inc.

CONTACT: Michele Boudreau of Maxygen, Inc., Investor and Public Relations,+1-650-279-2088, or michele.boudreau@maxygen.com

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