The presence of B type virions in trichoepithelioma of a mouse.
D000818:Animals; D005260:Female; D008321:Mammary Glands, Animal; D008324:Mammary Tumor Virus, Mouse / Q000648:ultrastructure*; D051379:Mice; D012376:Rodent Diseases / Q000382:microbiology*; D012878:Skin Neoplasms / Q000382:microbiology / Q000662:veterinary*; D014771:Virion