mortality/aging
• mutants arrest at E6.5 before primitive streak formation, are resorbing by E9.5 and do not form embryonic or extraembryonic mesoderm; an A-P axis is also not apparent
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embryo
• an A-P axis is not observed
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• mutant embryos exhibit growth arrest at E6.5 with an appearance similar to a pregastrulation stage embryo
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• mutants do not form embryonic or extraembryonic mesoderm
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