mortality/aging
• putative homozygous embryos appear as small masses of vacuolated cells in decidual crypts at the time normal embryos are implanting; the abnormal embryo is resorbed within 36 hours
• Background Sensitivity: the genotype of the mother, with or without Ay, determines if a homozygous embryo dies at the initial stage of implantation or after the process begins
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cellular
• introducing homozygous Ay embryos into the uterus of a wild-type mouse delays embryonic death until after implantation begins
• there are approximately twice the number of cells, development of a small ectoplacental cone and Reichert's membrane, and disintegration of the decidual epithelium characteristic of an advanced implantation site
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