Age dependent decline in proliferation of lymphocytes.
D000375:Aging; D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D002454:Cell Differentiation; D007111:Immunity, Cellular; D051379:Mice; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*