Relationship between aging and immune system.
D000375:Aging; D000818:Animals; D000917:Antibody Formation; D001327:Autoimmune Diseases / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D004912:Erythrocytes / Q000276:immunology; D006801:Humans; D007109:Immunity; D007111:Immunity, Cellular; D008198:Lymph Nodes / Q000187:drug effects / Q000276:immunology; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology