Samples of human milk from 59 women have been partially purified by highspeed density gradient ultracentrifugation. Pellets prepared from partially purified density gradient fractions have been examined by thin-section electron microscopy. Virus-like particles closely resembling various stages of the murine B and C-type RNA tumor viruses have been seen in samples of milk from nine women.
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Feller et al. (1971) studied this question.
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