Scientists Robert J. Lefkowitz (L) and Brian K. Kobilka (R) are introduced in Stockholm, capital of Sweden, on Oct. 10, 2012. Robert J. Lefkowitz and Brian K. Kobilka, both from universities in the United States, won the 2012 Nobel Prize in Chemistry, announced Staffan Normark, Permanent Secretary of Royal Swedish Academy of Sciences on Wednesday. <Xinhua/Liu Yinan>
