mortality/aging
• homozygous embryos are present in expected Mendelian ratios at E7.5; no homozygous embryos are recovered at E9.5
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embryo
• embryos fail to initiate gastrulation; no Brachyury (T)-positive cells are present at E7.5
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• embryos show a severe developmental delay at E7.5
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• a small egg cylinder is observed at E7.5
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• no Brachyury (T)-positive cells are present at E7.5
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• extraembryonic tissues are poorly organized at E7.5
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growth/size/body
• embryos show a severe developmental delay at E7.5
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