title: Letter: HL-A 27 in diagnosis of rheumatic diseases.
mesh_terms: D016918:Arthritis, Reactive / Q000175:diagnosis / Q000276:immunology*; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000276:immunology*; D003601:Cytotoxicity Tests, Immunologic; D006649:Histocompatibility Antigens / Q000302:isolation & purification*; D006801:Humans; D008297:Male; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000276:immunology*
chemical_list: D006649:Histocompatibility Antigens