title: Role of serum factors from tolerant mice in blocking and in immunological enhancement.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D002860:Chromium Radioisotopes; D003601:Cytotoxicity Tests, Immunologic; D006084:Graft Rejection; D007106:Immune Sera; D007108:Immune Tolerance; D007117:Immunization, Secondary; D008214:Lymphocytes / Q000276:immunology*; D051379:Mice; D012509:Sarcoma / Q000276:immunology; D013154:Spleen / Q000276:immunology; D014181:Transplantation Immunology
chemical_list: D002860:Chromium Radioisotopes; D007106:Immune Sera