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mam·ma·ry tu·mor vi·rus of mice
one of the mammalian Type B retroviruses, antigenically distinct from the murine leukemia-sarcoma complex, which is associated with adenocarcinomatous tumors of the mammary gland, commonly latent in wild and laboratory mice and causing cancer only in genetically susceptible strains under certain hormonal influences.
A substance present in certain strains of mammary cancer-prone mice that is transferred to offspring through milk from the mammary glands. It can induce the development of mammary cancer in suckling mice exposed to the factor.
See also: factor