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Nature Genetics 14, 400–405 (1 December 1996) | doi:10.1038/ng1296-400

Susceptible chiasmate configurations of chromosome 21 predispose to non|[ndash]|disjunction in both maternal meiosis I and meiosis II

Neil E. Lamb , Sallie B. Freeman , Amanda Savage-Austin , Dorothy Pettay , Lisa Taft , Jane Hersey , Yuanchao Gu , Joe Shen , Denise Saker , Kristen M. May , Dimitris Avramopoulos , Michael B. Petersen , Anni Hallberg , Margareta Mikkelsen , Terry J. Hassold & Stephanie L. Sherman