PerspectiveDevelopmental Biology

The Ups and Downs of a Sea Anemone

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Science  28 May 2004:
Vol. 304, Issue 5675, pp. 1255-1256
DOI: 10.1126/science.1099829

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Bilateral symmetry is thought to have emerged after the evolutionary split between cnidarians and bilaterians. In his Perspective, Holland discusses whether bilateral symmetry has an earlier evolutionary origin. New gene expression analyses in the starlet sea anemone suggest that bilateral symmetry may be homologous between sea anemones and bilaterians ( Finnerty et al.).