mortality/aging
• homozygous embryos complete preimplatation development but die between E4-5; resorbing embryos are seen through E9.5
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embryo
• cultured homozygous blastocysts do not hatch from the zona pellucida and die shortly thereafter
• chemical removal of the zona pellucida does not rescue the embryos from death; trophoblast outgrowths do not appear and embryos do not adhere to culture plates
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