Roger Tsien of the U.S. reacts after receiving the 2008 Nobel Prize in Chemistry at the Concert Hall in Stockholm Dec. 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."(Xinhuanet Photo)

    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 Dec. 10, 2008. (Xinhua/Reuters Photo)

    Winner of the 2008 Nobel Prize in chemistry, U.S. scientist Roger Tsien, blows a kiss after receiving his medal and diploma from Swedish King Carl XVI Gustaf in the concert hall in Stockholm Dec. 10, 2008. (Xinhua/Reuters Photo)