mortality/aging
• homozygotes die around E10.5; no homozygous newborns are ever found
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embryo
• at E7.5 and 8.5 there is minimal apoptosis compared to wild-type embryos
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• at E9.5. truncations in the anterior regions of homozygous embryos are seen
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• at E7.5 homozygotes are smaller than littermates
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• the anterior definitive endoderm is absent in mutants at E7.5
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• at E8.5 headfolds are reduced in size
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• at early somite stages truncations in the anterior neural folds are observed
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• induction of anterior neuroectoderm fails to occur and is missing in mutant embryos
• mutants have less cell proliferation in the region of the anterior neuroectoderm
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• at E7.5 and 8.0, mutants lack prechordal plate
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• the anterior visceral endoderm is mislocalized distally compared to wild-type embryos
• there is little proliferation observed at E6.0 in the anterior visceral endoderm of mutants
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growth/size/body
• at E7.5 homozygotes are smaller than littermates
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cellular
• at E7.5 and 8.5 there is minimal apoptosis compared to wild-type embryos
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nervous system
• induction of anterior neuroectoderm fails to occur and is missing in mutant embryos
• mutants have less cell proliferation in the region of the anterior neuroectoderm
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• at E10.5, homozygotes display a severe forebrain truncation
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• the diencephalon is entirely absent at E8.0
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• at E8.5 and E9.5, markers for telencephalon forebrain are absent in homozygotes
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• mutants have less cell proliferation in the region of the anterior neuroectoderm
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