title: Letter: HL-A antigens in juvenile rheumatoid arthritis.
mesh_terms: D001171:Arthritis, Juvenile / Q000276:immunology*; D002648:Child; D006680:HLA Antigens / Q000032:analysis*; D006649:Histocompatibility Antigens / Q000032:analysis*; D006801:Humans; D013167:Spondylitis, Ankylosing / Q000276:immunology
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens