title: Mammary tumor virus in strain GR mice in relation to age and tissue type.
mesh_terms: D000367:Age Factors; D000818:Animals; D005260:Female; D007774:Lactation; D008321:Mammary Glands, Animal / Q000382:microbiology*; D008325:Mammary Neoplasms, Experimental / Q000382:microbiology*; D008324:Mammary Tumor Virus, Mouse / Q000302:isolation & purification*; D051379:Mice; D008854:Microscopy, Electron; D011247:Pregnancy