embryo
• loss of columnar epithelial shape
• multiple layers
• minimal intercellular spaces
• normal tight junctions, adherens junctions, and desmosomes apically but not elsewhere
• basement membrane barely detectable
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• tight intercellular contacts between endoderm cells
• no basement membrane
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• differentiating at E7.5 but migrating poorly
• few intercellular spaces among invaginating mesoderm cells
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• head fold development at E8.5 is poor with a minimum of mesoderm
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• reduced in size at E6.5
• E6.5 embryos histologically normal despite size
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• multiple cell layers at E8.5
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• neuroectoderm is hypertrophic at E8.5
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• pre-somitic mesoderm is generated but segmented somites never form
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nervous system
• multiple cell layers at E8.5
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• neuroectoderm is hypertrophic at E8.5
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growth/size/body
• reduced in size at E6.5
• E6.5 embryos histologically normal despite size
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digestive/alimentary system
• foregut fails to close
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