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Directory Results for Received 30 March 2004 Accepted 15 April 2004 Published online 8 July 2004 Facultative adjustment of mammalian sex ratios in support of the Trivers Willard hypothesis: evidence for a mechanism Elissa Z - ncbi nlm nih to Received 30 November b1992/b/Accepted 12 February 1993 b - ncbi nlm nih