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Sexual differentiation and preimplantation cell growth
E Pergament1, M Fiddler, N Cho
1Department of Obstetrics and Gynecology, Northwestern University Medical School, Chicago, IL.
Human Reproduction (Oxford, England)
|September 1, 1994
Abstract:
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.