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John P. Walker has served as a director of the Company since April 1997. Since 2001 Mr. Walker acting as a consultant and investor has served as an Investment Advisor to MDS Capital Corporation Interim CEO of KAI Pharmaceuticals Chairman and Interim Chief Executive Officer at Guava Technologies Chairman and CEO of Bayhill Therapeutics and Chairman and Interim CEO of Centaur Inc. From 1993 to 2001 he was Chairman Chief Executive Officer and a director of Axys Pharmaceuticals Inc. and its predecessor company Arris Pharmaceutical Corporation. Prior to his association with Arris Mr. Walker was the Chairman and Chief Executive Officer of Vitaphore Corporation a biomaterials company which was sold to Union Carbide Chemical and Plastics Company Inc. in 1990. From 1971 to 1985 Mr. Walker was employed by American Hospital Supply Corporation in a variety of general management sales and marketing positions most recently serving as President of the American Hospital Company. Mr. Walker is a director of Renovis Inc. and certain other privately held biotechnology companies. He holds a B.A. from the State University of New York at Buffalo and is a graduate of the Advanced Executive Program J.L. Kellogg Graduate School of Management at Northwestern University. | 