What sets the mutation rate of a cell type in an animal species?

Abstract excerpt

Germline mutation rates per generation are strikingly similar across animals, despite vast differences in life histories. Analogously, in at least one somatic cell type, mutation burdens at the end of lifespans are comparable across mammals. These observations point to a key role for natural selection in shaping mutation rates. This Essay summarizes the patterns identified to date and outlines existing theories...

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