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Simple ectoderm epithelium over mesenchyme.
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Germinative cell repeated division of generates stratified epithelium. Differentiates into connective tissue and blood vessels
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proliferation generates folds in basement membrane, melanoblasts migrate into epithelium, and ectoderm contributes to nails, hair follictles and glands.
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Hair growth initiated at base of cord, lateral outgrowths form associated sebaceous glands.
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