mortality/aging
• die around E7.5
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embryo
• expression analysis detects patterning defects prior to gastrulation including defects in patterning of the extraembryonic ectoderm by E5.5
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• primitive streak formation is visible but mesoderm fails to reach the anterior or lateral limits instead accumulating on the posterior side
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• expression analysis indicates a deficit in anterior mesendoderm
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• tetraploid rescue allows embryos to survive past gastrulation but these embryos show severe posterior axis truncations at E9.5
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• arrest around E7.5
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• at E7.5
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• polarity is disturbed
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• appears smaller
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• no sign of node formation at E7.5
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growth/size/body
• at E7.5
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