[Morphology of tumor viruses with special reference to type A mouse tumor virus particles].
D000818:Animals; D017988:Gammaretrovirus; D007942:Leukemia, Experimental / Q000382:microbiology*; D008325:Mammary Neoplasms, Experimental / Q000382:microbiology*; D051379:Mice; D008854:Microscopy, Electron