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Regulating evolution
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DOI：10.1038/scientificamerican0508-60.png)
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The molecular zoo contains only DNA sequences of animals and DNA code that make up the genetic recipe for each species. Mutations in DNA switches that control body-shaping genes, rather than in the genes themselves, have been a significant source of evolving differences among animals. The genetic switches are those which turn gene on or off at the right time.
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