embryo
• at E7.5 embryos are shorter and rounder as compared to wild-type
• embryos appear constricted proximal to the epiblast
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• E7.5 embryos lack mesoderm
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• embryonic and extraembryonic epithelia are irregular
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• extraembryonic structures derived from mesoderm are absent
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• embryonic and extraembryonic epithelia are irregular
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• visceral endoderm is thickened
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• proximal visceral endoderm is polarized but lacks apical vacuoles
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mortality/aging
• embryos are resorbed by E9.5
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