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CellBioGuy comments on Open Thread, November 1 - 7, 2013 - Less Wrong Discussion
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New research suggests that the amount of variance in DNA among individual cells in a person may be much higher than is normally believed. See here.
I've already seen work to the effect that somatic cells often have ~10x the point mutations per human generation as the germline, which is protected by a small number of divisions per generation and low levels of metabolism and transcription. It was in mitochondrial rather than nuclear DNA, but the idea is similar.