mortality/aging
• die between E7.5 and E8.5
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embryo
• fail to elongate properly leaving extra space in the yolk sac around the distal tip
• in culture embryoid bodies do cavitate but the organization of the peripheral cell layers is abnormal
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• only occasionally show ingression of primitive ectodermal cells initiating the formation of mesoderm and only 2 of the 3 germ layers are present
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• at E7.0 cells are cuboidal
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• lack lateral symmetry at E7.0
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• fail to progress beyond the E6.5 stage
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• smaller in size at E7.0 but not at E5.5
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• at E7.0, the junction between the epiblast and extraembryonic region is less pronounced
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• not formed at E7.0
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• not formed at E7.0
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• at E7.0 no proamniotic cavity is evident
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• at E7.0 cells are cuboidal rather than a mix of cuboidal and columnar
• however, the parietal endoderm appears normal
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cellular
• in culture, embryonic stem cells fail to differentiate into muscle cells
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growth/size/body
• smaller in size at E7.0 but not at E5.5
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