title: Does aging weaken the body's major line of defense?
mesh_terms: D000375:Aging; D000818:Animals; D006801:Humans; D007111:Immunity, Cellular / Q000187:drug effects; D008198:Lymph Nodes / Q000276:immunology; D051379:Mice; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000502:physiology; D013934:Thymectomy; D013947:Thymosin / Q000494:pharmacology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D013947:Thymosin