Which direction do nevus cells move : Abtropfung reexamined

In 1893, Unna published his theory of Abtropfung in which he suggested that melanocytic nevus cells originate in the epidermis and drop off into the dermis. We studied 3,534 nevi from patients of all ages to reassess this almost sacred concept. If Unna was correct, one would expect that in childhood...

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