title: Reactivation of immunocompetence in spleen cells of aged mice.
mesh_terms: D000375:Aging; D000818:Animals; D000831:Animals, Newborn; D000921:Antibody-Producing Cells / Q000276:immunology; D006087:Graft vs Host Reaction; D006824:Hybridization, Genetic; D007111:Immunity, Cellular; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D013154:Spleen / Q000166:cytology / Q000276:immunology*; D013949:Thymus Extracts; D013950:Thymus Gland / Q000276:immunology*
chemical_list: D013949:Thymus Extracts