TWO AMERICANS SHARE NOBEL PRIZE IN CHEMISTRY

Roderick MacKinnon, seen in this undated photo, shares the 2003 Nobel Prize in Chemistry with Peter Agre, also from the U.S., "for discoveries concerning channels in cell membranes" it was announced on Oct. 8, 2003. MacKinnon works at the Rockefeller University, Howard Hughes Medical Institute in New York. (UPI/Rockefeller University)