Nobel Prize in Physiology or Medicine

The 2007 Nobel prize in Physiology or Medicine has just been announced.
Mario R Capecchi, Sir Martin J Evans and Oliver Smithies won for developing 'Knock-out' mice. They used stem cells to genetically modify the mice. It is now possible for scientists to insert or remove a single gene and study the effects.

Read more at:
http://nobelprize.org/