Cellular Immunogenetics—Definition of HLA-D Region Encoded Antigens by T Lymphocyte Reactivities1 1This work is suppored in part by NIH grants AI 11576, AI 08439, CA 16836 and National Foundation grants 1–246 and 6–78. This is paper No. 187 from the Immunobiology Research Center and paper No. 2343 from the Laboratory of Medical Genetics, The University of Wisconsin, Madison, Wisconsin.