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In the article "Molecular basis of mammalian sexual determination:Activation of Müllerian inhibiting substance gene expressionby SRY" by C. M. Haqq et al. (2 Dec., p. 1494), parts B andC of figure 1 were inadvertently interchanged. In figure 3A,the third, fourth, and fifth lanes should have been labeled"A7 T," "A7C," and "A7 G," respectively. In figure 5, thefactor labeled "SRIF's" should have been labeled "SRYIF's."