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Science 1 November 2002:
Vol. 298. no. 5595, pp. 1018 - 1020
DOI: 10.1126/science.1076018


Abstract
Full Text 		Independent Origins and Rapid Evolution of the Placenta in the Fish Genus Poeciliopsis
David N. Reznick, Mariana Mateos, and Mark S. Springer

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Science. ISSN 0036-8075 (print), 1095-9203 (online)