title: Direct observations on the effect of "proliferation inhibitory factor" on the clonal growth of target cells.
mesh_terms: D000818:Animals; D002455:Cell Division; D002999:Clone Cells; D046508:Culture Techniques; D003601:Cytotoxicity Tests, Immunologic; D004247:DNA / Q000096:biosynthesis; D006367:HeLa Cells / Q000254:growth & development; D007739:L Cells / Q000254:growth & development; D037102:Lectins / Q000494:pharmacology; D007962:Leukocytes / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D051379:Mice
chemical_list: D037102:Lectins; D004247:DNA