mortality/aging
• homozygotes die at E4 because blastocysts fail to enter S phase
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embryo
• homozygous blastocysts in culture fail to hatch from the zona pellucida
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• homozygous blastocysts in culture show no outgrowth
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• homozygous embryos fail to form egg cylinders and degenerate in the uterus
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cellular
• cells from homozygous blastocysts fail to proliferate and arrest at G1
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