HLA-B27 and ankylosing spondylitis in African blacks.
D000349:Africa; D044383:Black People; D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D015796:HLA-B27 Antigen; D006801:Humans; D008297:Male; D013167:Spondylitis, Ankylosing / Q000453:epidemiology*
D006680:HLA Antigens; D015796:HLA-B27 Antigen