Roger Tsien of the U.S. receives the 2008 Nobel Prize in Chemistry from Sweden's King Carl XVI Gustaf (R) at the Concert Hall in Stockholm December 10, 2008. The chemistry prize was awarded jointly to Tsien, Martin Chalfie of the U.S. and Japan's Osamu Shimomura "for the discovery and development of the green fluorescent protein, GFP". REUTERS/Bob Strong (SWEDEN)