title: Natural killer cells help defend the body.
mesh_terms: D000818:Animals; D006801:Humans; D007111:Immunity, Cellular; D007113:Immunity, Innate; D007372:Interferons / Q000502:physiology; D007694:Killer Cells, Natural / Q000276:immunology*; D051379:Mice; D008819:Mice, Nude / Q000276:immunology; D009369:Neoplasms / Q000276:immunology*; D009374:Neoplasms, Experimental / Q000276:immunology; D014777:Virus Diseases / Q000276:immunology*
chemical_list: D007372:Interferons