title: HLA-DR typing of frozen B lymphocytes.
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology*; D005615:Freezing; D006680:HLA Antigens / Q000032:analysis*; D006650:Histocompatibility Testing; D006801:Humans; D014343:Trypan Blue
chemical_list: D006680:HLA Antigens; D014343:Trypan Blue