title: Lymphatic leukemia and retrieval of defective Friend virus in athymic nude rats.
mesh_terms: D000818:Animals; D005622:Friend murine leukemia virus / Q000235:genetics* / Q000302:isolation & purification; D007942:Leukemia, Experimental / Q000382:microbiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D051381:Rats; D011922:Rats, Mutant Strains; D013045:Species Specificity