mortality/aging
• embryonic lethality occurs between E7.5 and E8.5
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embryo
• absence of a primitive streak and any discernable mesoderm suggests that the anterior-posterior axis does not form in E7.5 embryos
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• growth of embryonic and extra-embryonic tissues between E5.5 and E7.5 is slow and has defects
• a lack of visceral endoderm suggests embryos arrest development prior to E5.5
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• mesoderm does not form by E7.5
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• a primitive streak does not form by E6.5
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• the anterior visceral endoderm fails to form in E5.5 embryos
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• the distal visceral endoderm fails to form in E5.5 embryos
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cellular
• at E5.5, E6.5 and E7.5, levels of phosphorylated histone-3 are reduced by 40-50% indicating a decrease in cellular proliferation
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