Jumping genes, which make DNA copies of themselves through an RNA middleman, provide a stochastic process for generating brain diversity among humans. The effect of their random insertion, however, is a bit of a gamble.
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Martin, S. Jumping-gene roulette. Nature 460, 1087–1088 (2009). https://doi.org/10.1038/4601087a
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DOI: https://doi.org/10.1038/4601087a
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