title: SYMPOSIUM. ACQUIRED AND NATURAL TOLERANCE TO DEFINED ANTIGENS.
mesh_terms: D000917:Antibody Formation; D000941:Antigens; D006801:Humans; D007108:Immune Tolerance; D007109:Immunity; D013934:Thymectomy; D013950:Thymus Gland; D014181:Transplantation Immunology
chemical_list: D000941:Antigens
keywords: ANTIBODY FORMATION; ANTIGENS; IMMUNE TOLERANCE; IMMUNITY; THYMECTOMY; THYMUS GLAND; TRANSPLANTATION IMMUNOLOGY