Natural immunity. History, present, and future.
D000486:Allergy and Immunology / Q000266:history; D000818:Animals; D003602:Cytotoxicity, Immunologic; D049673:History, 20th Century; D006801:Humans; D007113:Immunity, Innate; D007694:Killer Cells, Natural / Q000276:immunology; D051379:Mice; D009369:Neoplasms / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology