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Proviral MMTV(SIM) DNA sequences specifically amplified from FACS-sorted B cells (>98% pure) by PCR and detected by liquid hybridization 2 and 4 days after injection of 2 μl of MMTV(SIM) containing purified milk with or without AZT treatment 36 h after MMTV injection. All Mtvs are shown as internal controls for the amount of DNA. The results were analyzed by instant imager (see text).
