Risk of developing ankylosing spondylitis in HLA-B27 positive individuals.
D006680:HLA Antigens / Q000032:analysis*; D015796:HLA-B27 Antigen; D006801:Humans; D012306:Risk; D013167:Spondylitis, Ankylosing / Q000453:epidemiology*
D006680:HLA Antigens; D015796:HLA-B27 Antigen