title: HLA-DR typing: some relevant difficulties.
mesh_terms: D000906:Antibodies / Q000302:isolation & purification; D001402:B-Lymphocytes / Q000276:immunology*; D001792:Blood Platelets; D001793:Blood Preservation; D000939:Epitopes; D006680:HLA Antigens / Q000276:immunology*; D006650:Histocompatibility Testing; D006801:Humans; D007106:Immune Sera; D009000:Monocytes
chemical_list: D000906:Antibodies; D000939:Epitopes; D006680:HLA Antigens; D007106:Immune Sera