title: A high frequency of cytotoxic precursor cells for a syngeneic tumour.
abstract: The average frequency of cytotoxic precursor cells in DBA/2 lymph node cell preparations reactive to the syngeneic tumour P815 has been determined as 1 in 2000. This frequency is similar to the precursor frequency for an allogeneic tumour EL-4. The normal lack of response of DBA/2 lymph node cells to the syngeneic tumour P815 in vitro cannot be attributed to a lack of cytotoxic precursor cells. We conclude that in this tumour-host system non-immunogenicity reflects a defect at the inductive step.
mesh_terms: D000818:Animals; D002460:Cell Line; D002478:Cells, Cultured; D003208:Concanavalin A / Q000494:pharmacology; D003602:Cytotoxicity, Immunologic; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology*; D008297:Male; D012515:Mast-Cell Sarcoma / Q000276:immunology; D051379:Mice; D008811:Mice, Inbred DBA; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology*; D012513:Sarcoma, Experimental / Q000276:immunology; D014185:Transplantation, Isogeneic
chemical_list: D003208:Concanavalin A