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Nature 408, 416-417 (23 November 2000) | doi:10.1038/35044169

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Evolutionary biology: Déjà vu

J. J. Bull

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A long-term study of fruitflies adds to the evidence that evolution can run backwards. To what extent the genetic underpinnings revert to the original is unclear.

We tend to think of evolutionary change as resulting in something different or new. But evolution going backwards, in which an organism reverts to a previous state, has its own possibilities and puzzles.