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Elementary lesion - increasing grades of severity in basal cell hyperplasia: A) normal, epithelium basal layer thickness is less than 15% of the entire thickness; B) mild basal cell hyperplasia ranges between 15% and 30%; C) severe basal cell hyperplasia: basal cells occupy more than 30% of whole epithelial thickness. Magnification 20x. Reprinted from ref. 10 with permission from Virchows Archiv, Springer Nature.
