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Arthur D. Levinson has served as a member of our board of directors since April 2004. Since July 1995, Art has served as a member of the board of directors of Genentech, Inc., a biotechnology company, and has served as its Chairman and Chief Executive Officer since September 1999. Prior to 1999, Art held various executive positions at Genentech, including Senior Vice President of R&D. Art has been a member of the board of directors of Apple Computer, Inc., a computer hardware and software company, since 2000. Art was a Postdoctoral Fellow in the Department of Microbiology at the University of California, San Francisco. Art holds a Ph.D. in biochemistry from Princeton University and a Bachelor of Science degree in molecular biology from the University of Washington. | 