Type-B mammary tumor virus particles were detected by electron microscopy in the submaxillary glands of 6 of 27 freshly trapped, pregnant wild mice (Mus musculus). Type-B particles were also detected in 3 9f 24 seminal vesicles and 2 pulmonary adenomas from wild mice. Intracytoplasmic type-A virus particles were found in 7 spontaneous nonmammary tumors (lymphoma, hepatoma, lung adenoma) of aging wild mice. Type-C virus particles were also detected in many of these tissues.
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Rongey et al. (1975) studied this question.