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Natural Selection: Carrot or Stick?

Diseases Are Due Mainly to Rare Variants, Study Hints

By Anette Breindl

Wednesday, April 13, 2011
In medical school, one of the things that students are taught is "when you hear hoofbeats, think horses, not zebras" – that is, common symptoms are most likely to be caused by common diseases. Or in practical terms, when you see a barfing child, think "stomach virus," not "brain tumor."

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