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Jack W. Szostak

3 U.S. scientists share Nobel Prize in medicine

3 U.S. scientists share Nobel Prize in medicine

Three U.S. scientists who discovered key aspects of how cells and animals age and how cancer cells become immortal have won the 2009 Nobel Prize in physiology or medicine. Elizabeth Blackburn of UC San Francisco, Carol W. Greider of Johns Hopkins University School of Medicine and Jack W. Szostak of Harvard Medical School will share the $1.4-million award for their discovery of telomeres, small sections of DNA that protect the integrity of cellular DNA as animals and most other organisms age. They also discovered telomerase, the enzyme that manufactures telomeres and gives cancer cells their eternal life. Ten women have won the Nobel in medicine in the past, but Monday's announcement...