U.S. scientist Roger Tsien, joint 2008 Nobel Prize winner in Chemistry, celebrates with a glass of champagne at the University of California San Diego following a news conference at the school in La Jolla, California October 8, 2008. Japanese researcher Osamu Shimomura and Americans Tsien and Martin Chalfie were jointly awarded the 2008 Nobel Prize for Chemistry on Wednesday. They won "for the discovery and development of the green fluorescent protein, GFP".
REUTERS/Mike Blake (UNITED STATES)