title: The HLA system in rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D006680:HLA Antigens / Q000276:immunology*; D006684:HLA-DR Antigens; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006801:Humans
chemical_list: D006680:HLA Antigens; D006684:HLA-DR Antigens; D015804:HLA-DR4 Antigen; D000949:Histocompatibility Antigens Class II