PerspectiveDevelopmental Biology

How Many Ways to Make a Chordate?

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Science  26 May 2006:
Vol. 312, Issue 5777, pp. 1145-1146
DOI: 10.1126/science.1128784

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The regulatory gene circuits that control the development of a protochordate are simpler than those of sea urchins or vertebrates, indicating that their similar tadpole-like body plan can be constructed in several ways.