title: Theories of delayed hypersensitivity.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001665:Binding Sites; D005075:Biological Evolution; D000939:Epitopes; D006801:Humans; D006968:Hypersensitivity, Delayed; D007111:Immunity, Cellular; D008214:Lymphocytes / Q000276:immunology; D014714:Vertebrates
chemical_list: D000939:Epitopes