Three scientists shared the 2013 Nobel Prize in Physiology or Medicine the Nobel Assembly at Swedish Karolinska Institute in Stockholm announced on Monday.James E. Rothman Randy W. Schekman and Thomas C. Sudhof were picked 'for their discoveries of machinery regulating vesicle traffic a major transport system in our cells' said Goran Hansson Secretary of the Nobel Assembly at Swedish Karolinska Institute.Through their discoveries Rothman Schekman and Sudhof have revealed the exquisitely precise control system for the transport and delivery of cellular cargo the assembly said in a statement.Schekman identified three classes of genes that control different facets of the cell's