title: Decreased susceptibility to the mammary tumour agent in mice with advancing age.
mesh_terms: D000375:Aging; D000818:Animals; D005260:Female; D008321:Mammary Glands, Animal / Q000637:transplantation; D008325:Mammary Neoplasms, Experimental; D008324:Mammary Tumor Virus, Mouse / Q000472:pathogenicity*; D051379:Mice; D014184:Transplantation, Homologous