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Many Rare Mutations May Underpin Diseases
New York Times

The task of finding the genetic roots of common disease seems much harder, dimming the promise of personal genomics and the chances of quick medical payoffs from the human genome project, given new data about the human genome in two reports published online in the journal Science on Thursday. It now appears that large numbers of very rare genetic mutations may underlie common human diseases like schizophrenia and cancer. But because the mutations are so rare, costly studies involving large numbers of patients would be needed to identify their role in each disease.

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