title: Unclassified HLA-B27 inflammatory rheumatic diseases: followup of 23 patients.
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006680:HLA Antigens / Q000145:classification*; D006801:Humans; D007249:Inflammation; D008297:Male; D008875:Middle Aged; D012216:Rheumatic Diseases / Q000145:classification*; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*
chemical_list: D006680:HLA Antigens