mortality/aging
• no embryos are recovered after E8.5 when mice are present in expected Mendelian ratios
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embryo
• embryonic development is arrested at the pre-streak stage, mesoderm does not form, embryonic tissues are reduced, and patterning of embryonic tissues is either arrested or incorrect resulting in a failure to gastrulate
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• at E8.5, embryos are three times the size they were at E7.5 and appear to be undifferentiated ectoderm, expanded into a highly organized structure
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• at E7.5, embryonic ectoderm (epiblast) does not differentiate
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• at E7.5
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• at E8.5, trophoblast giant cells are abundant
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• at E7.5, visceral endoderm morphology resembles that of the extraembryonic region
• at E8.5, visceral endoderm with extraembryonic morphology is expanded, vacuolated and folded upon itself into a thick layer
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