mortality/aging
• no mice are produced from breeding heterozygous mice
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embryo
• disruption at early gastrulation stage
• absence of late gastrulation stage structures at E7.5
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• reduced cell density
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• absent primitive streak
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• reduced cell density in the embryonic mesoderm
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• cells are piled up in visceral endoderm
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cellular
• cell cycle arrest in post-implantation epiblast
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• in post-implantation epiblast
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