title: Changes in cellular regulation with age. I. Effect on the antigenic competition phenomena.
mesh_terms: D000375:Aging; D000818:Animals; D000917:Antibody Formation; D000921:Antibody-Producing Cells / Q000187:drug effects / Q000276:immunology*; D000937:Antigen-Antibody Reactions / Q000187:drug effects; D003520:Cyclophosphamide / Q000494:pharmacology; D004912:Erythrocytes / Q000276:immunology; D005260:Female; D007121:Immunocompetence; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D051381:Rats / Q000276:immunology; D012756:Sheep / Q000276:immunology
chemical_list: D003520:Cyclophosphamide