title: Letter: HL-A antigens and inflammatory bowel disease.
mesh_terms: D001168:Arthritis / Q000150:complications / Q000276:immunology*; D003093:Colitis, Ulcerative / Q000150:complications / Q000276:immunology*; D006649:Histocompatibility Antigens / Q000302:isolation & purification*; D006801:Humans; D012446:Sacroiliac Joint; D013166:Spondylitis / Q000150:complications / Q000276:immunology*
chemical_list: D006649:Histocompatibility Antigens