title: Letter: HL-A and disease.
mesh_terms: D016918:Arthritis, Reactive / Q000276:immunology; D004194:Disease; D000939:Epitopes; D006649:Histocompatibility Antigens; D006650:Histocompatibility Testing; D013167:Spondylitis, Ankylosing / Q000276:immunology
chemical_list: D000939:Epitopes; D006649:Histocompatibility Antigens