Gurdon and Yamanaka win Nobel prize for stem cell work
8 October 2012 Last updated at 23:17 BST
Two pioneers of stem cell research have shared the Nobel prize for medicine or physiology.
John Gurdon from the UK and Shinya Yamanaka from Japan were awarded the prize for changing adult cells into stem cells, which can become any other type of cell in the body.
The Nobel committee said they had "revolutionised" science.
David Shukman reports.