title: Heavy HLA-DR (Ia) antigen chain is controlled by the MHC region.
mesh_terms: D000954:Antigens, Surface / Q000032:analysis / Q000235:genetics*; D000939:Epitopes; D005796:Genes; D006680:HLA Antigens / Q000032:analysis / Q000235:genetics*; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology; D046911:Macromolecular Substances; D008285:Major Histocompatibility Complex; D008970:Molecular Weight
chemical_list: D000954:Antigens, Surface; D000939:Epitopes; D006680:HLA Antigens; D046911:Macromolecular Substances