title: The HL-A B27 histocompatibility antigen in rheumatoid arthritis variants.
mesh_terms: D001171:Arthritis, Juvenile / Q000276:immunology; D016918:Arthritis, Reactive / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D006649:Histocompatibility Antigens / Q000302:isolation & purification*; D006801:Humans; D013167:Spondylitis, Ankylosing / Q000276:immunology
chemical_list: D006649:Histocompatibility Antigens