mortality/aging
• die between E10.5 and E11.5
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embryo
• Nodal signaling is impaired
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• fail to turn at E8.5
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• arrest after initiation of gastrulation
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• ectopic folds in the embryonic region at E7.5
• unlike in null mice, the A-P axis is established
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• enlarged at E8.5
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• at E8.5
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cardiovascular system
• absence of a beating heart at E8.5
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