Thirteenth Annual ADF Meeting.

This article presents the research papers presented in the Thirteenth Annual ADF Meeting, which was held in November 1985 at Vienna, Austria. The paper on "Tac Antigen Expression by Malignant Lymphocytes Infiltrating the Skin-Pathogenetic Considerations," by V. Groh, U. Kö ller and G. Stingi focuses on T cell proliferation. Some other topics covered are cutaneous lesions in histiocytosis X, HTLV-1 positive primary cutaneous B-cell Lymphoma, and human epidermal, Langerhans cells in culture.