U.S. scientist Roger Tsien, joint 2008 Nobel Prize winner in Chemistry, waits to speak at a University of California San Diego news conference 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)