Association of HLA-B27 with ankylosing spondylitis.
D001416:Back Pain / Q000175:diagnosis; D006680:HLA Antigens / Q000032:analysis*; D015796:HLA-B27 Antigen; D006801:Humans; D011859:Radiography; D011877:Radionuclide Imaging; D012446:Sacroiliac Joint / Q000000981:diagnostic imaging; D013167:Spondylitis, Ankylosing / Q000175:diagnosis / Q000276:immunology*
D006680:HLA Antigens; D015796:HLA-B27 Antigen