title: Letter: HLA B27 in blacks with ankylosing spondylitis or Reiter's disease.
mesh_terms: D016918:Arthritis, Reactive / Q000235:genetics / Q000276:immunology*; D044383:Black People; D003424:Crohn Disease / Q000235:genetics / Q000276:immunology; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D009656:North America; D013167:Spondylitis, Ankylosing / Q000235:genetics / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens