Mammary Tumor Virus in Strain GR Mice in Relation to Age and Tissue Type 2

Abstract
Normal and neoplastic mammary tissues of GR/Crgl mice were examined for the presence of mammary tumor virions. Detection of both B and cytoplasmic A particles in normal glands from mice 2 weeks of age and older was the earliest reported occurrence of such particles. Virus particles were not found in normal tissues from mice 24 hours or 1 week old. All neoplastic tissues examined had moderate or abundant virus particles. The possible relationship of these results to the mode of viral transmission was discussed.

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