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Embryonic identity crisis

The oldest known animal fossils, identified as eggs and embryos, had been expected to reveal secrets from a period of great evolutionary change. Will the latest theory about the fossils' origins confound these hopes?

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Figure 1: Fossil embryos?


  1. This article and the paper concerned3 were published online on 20 December 2006.


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Donoghue, P. Embryonic identity crisis. Nature 445, 155–156 (2007).

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