title: Moloney leukaemia virus as a helper in retrieving Friend virus from a non-infectious reticulum cell sarcoma.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D005622:Friend murine leukemia virus / Q000302:isolation & purification*; D006378:Helper Viruses; D007942:Leukemia, Experimental / Q000382:microbiology*; D008228:Lymphoma, Non-Hodgkin / Q000382:microbiology*; D051379:Mice; D008979:Moloney murine leukemia virus; D009368:Neoplasm Transplantation; D012513:Sarcoma, Experimental / Q000382:microbiology*; D014776:Virus Cultivation