Two Israelis and an American have won the 2004 Nobel Prize for Chemistry for their work related to how the human body singles out unwanted proteins for destruction to defend itself from disease.
Israelis Aaron Ciechanover, Avram Hershko and American Irwin Rose were awarded the prize for discovering a 'kiss of death' marker for proteins, helping explain the immune system.
This is the second year in a row that the Chemistry Prize has been awarded for a medical discovery, after last year's honoured research on molecular biology.
