Cellular hypersensitivity.
D000818:Animals; D002645:Chickens; D006168:Guinea Pigs; D006648:Histocompatibility; D006968:Hypersensitivity, Delayed; D007109:Immunity; D066298:In Vitro Techniques; D008208:Lymphatic System / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology*; D008264:Macrophages / Q000276:immunology; D051379:Mice; D009368:Neoplasm Transplantation; D009369:Neoplasms / Q000276:immunology; D014181:Transplantation Immunology