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Acad antigen assay Benacerraf biochemical biological bone marrow Cancer Inst Cancer Res cell lines cell-mediated cellular characterization clinical clones culture cytotoxic T cells differentiation effects of interferons enhancement expression Farrar fibroblasts Fidler function Gallo Gershon Gillis Goldstein Gresser Hellstrom helper helper T cells Herberman HTLV human interferon immune response Immunol immunologic induced inhibition injection interactions interferon interleukin Kripke leukemia leukemic cells leukocyte lymphocytes lymphoid cells lymphokines lymphoma macrophages mammary tumors mediated metastatic mitogenic Mizel molecular weight monoclonal antibodies monocytes mouse murine myeloid Natl natural killer cell neoplasms NK cells normal Proc proliferation protein purified reactivity receptors role Ruscetti sarcoma serum specific spleen spleen cells stimulation studies Stutman subpopulations suppression suppressor cells syngeneic syngeneic tumor synthesis T-cell growth factor T-cell lines TCGF production thymic factors thymocytes thymosin thymus tissue transplanted tumor cells tumor growth tumor-bearing mice virus vitro vivo