title: Nature of cellular dificiencies in age-related decline of the immune system.
mesh_terms: D000375:Aging; D000818:Animals; D000917:Antibody Formation; D000921:Antibody-Producing Cells / Q000276:immunology; D000941:Antigens; D001402:B-Lymphocytes / Q000276:immunology; D002452:Cell Count; D002455:Cell Division; D002469:Cell Separation; D004912:Erythrocytes / Q000276:immunology; D006462:Hemolytic Plaque Technique; D006824:Hybridization, Genetic; D007109:Immunity; D007111:Immunity, Cellular; D007153:Immunologic Deficiency Syndromes / Q000276:immunology* / Q000473:pathology / Q000503:physiopathology; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D012756:Sheep / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000941:Antigens