Clear and Dark Basal Keratinocytes in Human Epidermis

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Abstract
Standardized techniques of stereologic cytology were applied to normal human epidermis, in order to comparatively describe the suprabasal and the dark and clear basal keratinocytes. The results, expressed mainly in surface and volume densities of epidermal components, showed that some important stereologic parameters of dark basal keratinocyte constituents exhibited values which could be interpreted as intermediate between those of the clear basal keratinocytes and those of the suprabasal keratinocytes. Although the degenerative nature of dark cells cannot be ruled out, the stereologic characterization of their cell architecture also could indicate that dark basal cells are already differentiating keratinocytes still remaining in the basal layer.

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