mortality/aging
• homozygous mutant embryos die between E3.5 and E6.5
• no embryos are detected between E6.5 and E12.5
• however, in vitro, mutant blastocysts are viable and capable of hatching and forming both an inner cell mass and a trophectoderm
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embryo
• at E6.5, presumptive mutant embryos fail to display both the embryonic ectoderm and the embryonic endoderm and appear as a small mass of pyknotic cells
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• the embryonic ectoderm is not present at E6.5
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• the embryonic endoderm is not present at E6.5
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• a region resembling the ectoplacental cone is detectable but lacks the typical cobblestone appearance at E6.5
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reproductive system
• only empty decidua with embryo remnants are present at E6.5
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