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Stewart J. Hen has served as a member of our board of directors since May 2004. Mr. Hen has been with Warburg Pincus, LLC, a venture capital and private equity firm, since May 2000 and is currently a managing director, where he focuses on investments in the life sciences sector, including biotechnology, pharmaceuticals, specialty pharmaceuticals, drug delivery and diagnostics. Prior to joining Warburg Pincus, he was a management consultant at McKinsey & Company, where he advised pharmaceutical and biotechnology companies on a range of strategic management issues. Prior to joining McKinsey, he worked at Merck in research and development and manufacturing. Mr. Hen is also a director of Allos Therapeutics, Inc., Neurogen Corporation and Rib-X Pharmaceuticals, Inc. and is a former director of The Medicines Company, Triangle Pharmaceuticals, Inc., and Synaptic Pharmaceuticals Corporation. Mr. Hen also serves on the Health Care & Sciences Group of the New York City Investment Fund. Mr. Hen holds an M.B.A. from The Wharton School at the University of Pennsylvania, an M.S. in chemical engineering from the Massachusetts Institute of Technology and a B.S. in chemical engineering from the University of Delaware. | 