title: T-T interaction in the generation of helper cells in vitro.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D002469:Cell Separation; D003601:Cytotoxicity Tests, Immunologic; D000939:Epitopes; D005288:Ferredoxins / Q000276:immunology; D006241:Haptens; D006462:Hemolytic Plaque Technique; D007111:Immunity, Cellular; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008808:Mice, Inbred CBA; D013154:Spleen / Q000276:immunology; D013329:Structure-Activity Relationship; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000939:Epitopes; D005288:Ferredoxins; D006241:Haptens