title: HLA-B7 and ankylosing spondylitis in American blacks.
mesh_terms: D044383:Black People; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D013167:Spondylitis, Ankylosing / Q000235:genetics* / Q000276:immunology; D014481:United States; D001741:Black or African American
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens