The mammary tumor virus (MTV).
D000230:Adenocarcinoma / Q000209:etiology; D000818:Animals; D005260:Female; D006728:Hormones; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000097:blood / Q000235:genetics / Q000276:immunology; D008324:Mammary Tumor Virus, Mouse / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008854:Microscopy, Electron; D009368:Neoplasm Transplantation
D006728:Hormones