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it turns out that a large portion of the cells in healthy people carry far more mutations than expected, including some mutations thought to be the prime drivers of cancer. These mutations make a cell grow faster than others, raising the question of why full-blown cancer isn’t far more common.

“This is quite a fundamental piece of biology that we were unaware of,” said Inigo Martincorena, a geneticist at the Wellcome Sanger Institute in Cambridge, England.

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