title: The influence of B27 antigen on the clinical and radiographic picture of definite or classical rheumatoid arthritis.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging / Q000276:immunology*; D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D015796:HLA-B27 Antigen; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography
chemical_list: D006680:HLA Antigens; D015796:HLA-B27 Antigen