Two British scientists are to share the Nobel prize for medicine. Sydney Brenner and Sir John Sulston, will share the award with US scientist Robert Horvitz. They are being recognised for their work into how genes control the division of the body's cells and the development of organs. This work has helped understanding of the development of many diseases, the Nobel Institute said in its citation. Among their discoveries is the genetic mechanism controlling the programmed death of cells at the end of their lives. It helps scientists understand conditions such as Aids, strokes and heart attacks, where cells are lost because of excessive cell death. News of the award, worth 10m Swedish kroner, or just over $1m, was announced in Stockholm on Monday.