Hematoxylin and eosin-stained low-power photomicrograph of the tumor. Photomicrograph showing lining epithelium with focal apocrine snouting. Photomicrograph showing artefactual tubular ...

The skin epidermis has become the paradigm for exploring how a stratified epithelium develops in the embryo and how, in the adult, it maintains an inner layer of proliferating cells that gives ...