Sexual differentiation and preimplantation cell growth.
Pergament, E; Fiddler, M; Cho, N; Johnson, D; Holmgren, WJ
Human reproduction (Oxford, England), 9(9):1730-1732, 1994
Human reproduction (Oxford, England)
Growth rates of human preimplantation embryos fertilized in vitro were assessed and compared to the sex of the pregnancy outcome. The likelihood of a liveborn male was significantly greater than that of a female if the mean number of cells/embryo was four or greater at the scheduled time of transfer (odds ratio of 6:1). This finding suggested that the Y chromosome expresses factors which influence embryonic growth rates immediately after fertilization.
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