title: Immunologic tolerance to defined antigens and haptens. Introductory remarks.
mesh_terms: D000818:Animals; D000941:Antigens; D003877:Dermatitis, Contact / Q000276:immunology; D006168:Guinea Pigs; D006241:Haptens; D007108:Immune Tolerance
chemical_list: D000941:Antigens; D006241:Haptens