title: Reactivity of nonsensitized thymocytes to antigen: release of specific lymphocyte-activating substances.
mesh_terms: D000367:Age Factors; D000818:Animals; D000917:Antibody Formation; D000918:Antibody Specificity; D000921:Antibody-Producing Cells; D000941:Antigens; D001665:Binding Sites; D000939:Epitopes; D007111:Immunity, Cellular; D008214:Lymphocytes / Q000276:immunology*; D051381:Rats; D013950:Thymus Gland / Q000166:cytology / Q000276:immunology*
chemical_list: D000941:Antigens; D000939:Epitopes