mortality/aging
• although born in a normal Mendelian ratio, all die within hours of birth
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integument
• rudimentary stratified epithelium
• hyperproliferative epidermis
• colonies of epidermal cells in culture remain proliferative much longer, incorporating BrdU at high levels even at passage 5
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• expanded basal layer
• nests of basal epithelium in patches covering 20-30% of embryo
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• expanded spinous layer
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• fragile epidermis is easily detached from the dermis
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