Aging, immunity, and malignancy.
D000368:Aged; D000375:Aging; D000818:Animals; D002060:Bursa of Fabricius / Q000254:growth & development; D006801:Humans; D006968:Hypersensitivity, Delayed; D007109:Immunity; D007153:Immunologic Deficiency Syndromes / Q000150:complications; D008221:Lymphoid Tissue / Q000254:growth & development / Q000502:physiology; D051379:Mice; D009369:Neoplasms / Q000209:etiology*; D013950:Thymus Gland / Q000254:growth & development / Q000276:immunology / Q000502:physiology