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In mouse cell lines derived from mammary adenocarcinomnas, the synthetic steroid dexamnethasone stimulates production of murine mammary tumor virus. Viral RNA and antigens are increased as much as 20-fold, and culture fluid supernatants from steroid-treated cells contain type B particles with reverse transcriptase. These cells provide a possible tissue culture source of this virus and a model system for studying the mechanism of action of corticosteroids and the regulation of transcription of integrated viral DNA.
Parks et al. (Fri,) studied this question.
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