title: HLA B27 and risk of ankylosing spondylitis.
mesh_terms: D000293:Adolescent; D002321:Career Choice; D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D006801:Humans; D008297:Male; D012306:Risk; D013167:Spondylitis, Ankylosing / Q000276:immunology*
chemical_list: D006680:HLA Antigens