mortality/aging
• embryos die around E9.5-E12.5
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embryo
• developmental arrest around E8; E9.5 embryos develop only to the 5-6 somite stage instead of to the wild-type 21-25 somite stage
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cellular
• primary embryonic fibroblasts from E9 embryos show severe growth defects
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• increase in apoptosis in E9.5 embryos
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