mortality/aging
• embryos are not recovered after E7.5
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embryo
• defects in embryonic polarity and tissue patterning at E6.5
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• defect in mesoderm formation
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• at E6.5
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• absent at E6.5
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• lack a clear distinction between the epiblast and extraembryonic ectoderm
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• expression analysis indicates absence of extraembryonic ectoderm at E5.5
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• at E6.5 the proamniotic cavity is undivided
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• abnormally broad at E5.5
• at E6.5 markers of the AVE are expanded around the epiblast
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growth/size/body
• at E6.5
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