Immunohistochemical study on pigmented nevi (preliminary communication).

The human ABH blood-group antigen expression of cytokeratin, S-100 protein, and the melanoma-associated antigen was studied in 12 cases of pigmented nevi. The biotin-streptavidin immunostaining system was applied. ABH antigens were found both in the endothelial cells and in the germinative epidermal layer.