Juleen Zierath (R), chairman of the Nobel committee for medicine or physiology, speaks during the announcement of the winners of the 2013 Nobel prize for medicine or physiology at the Nobel Assembly at the Karolinska Institute in Stockholm October 7, 2013. Two Americans, James Rothman and Randy Schekman, and Germany's Thomas Sudhof won the 2013 Nobel prize for medicine or physiology for research into how the cell organises its transport system, the award-giving body said on Monday. [Photo/Agencies]

STOCKHOLM -- Three scientists shared the 2013 Nobel Prize in Physiology or Medicine, the Nobel Committee at Swedish Karolinska Institute announced on Monday.

The 2013 Nobel Prize in Physiology or Medicine went to James E. Rothman, Randy W. Schekman and Thomas C. Sudhof "for their discoveries of machinery regulating vesicle traffic, a major transport system in our cells," said the Nobel Assembly in a statement.

"The three Nobel Laureates have discovered the molecular principles that govern how this cargo is delivered to the right place at the right time in the cell," added it.