title: Letter: T cell-dependent mediator in the immune response.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D004912:Erythrocytes / Q000276:immunology; D066298:In Vitro Techniques; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008808:Mice, Inbred CBA; D012756:Sheep / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*