title: HLA 27 positive, negative, or both?
mesh_terms: D000328:Adult; D016918:Arthritis, Reactive / Q000175:diagnosis / Q000276:immunology; D005188:False Negative Reactions; D005260:Female; D006680:HLA Antigens / Q000032:analysis*; D006801:Humans
chemical_list: D006680:HLA Antigens