title: Attempts to obtain a Friend virus-induced ascites tumor free of the virus.
mesh_terms: D000818:Animals; D003588:Cytopathogenic Effect, Viral; D005622:Friend murine leukemia virus; D007106:Immune Sera / Q000494:pharmacology; D051379:Mice; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental; D014181:Transplantation Immunology; D014184:Transplantation, Homologous
chemical_list: D007106:Immune Sera