title: HLA B27 prevalence in spondylo-arthropathy syndromes.
mesh_terms: D000293:Adolescent; D000328:Adult; D001168:Arthritis / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D005260:Female; D006680:HLA Antigens / Q000032:analysis* / Q000235:genetics; D006801:Humans; D008297:Male; D012737:Sex Factors; D013167:Spondylitis, Ankylosing / Q000276:immunology*
chemical_list: D006680:HLA Antigens