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SUBSEQUENT EVENT	9 Months Ended
SUBSEQUENT EVENT	Sep. 30, 2013
SUBSEQUENT EVENT
SUBSEQUENT EVENT	12. SUBSEQUENT EVENT Sale of Stock On October 29, 2013, the Company and Glaxo Group Limited, an affiliate of GSK, entered into an agreement to purchase 130,473 shares of the Company’s common stock at $37.66 per share, for an aggregate purchase price of approximately $4.9 million, pursuant to its rights under the Company’s governance agreement with GSK dated June 4, 2004, as amended.