title: HL-A system and juvenile rheumatoid arthritis.
mesh_terms: D000293:Adolescent; D001171:Arthritis, Juvenile / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D003601:Cytotoxicity Tests, Immunologic; D006649:Histocompatibility Antigens / Q000032:analysis; D006650:Histocompatibility Testing; D006801:Humans
chemical_list: D006649:Histocompatibility Antigens