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DNA products derived from RT-PCRs of total RNA from a culture of strain ULPAs1 grown in the presence of arsenite (lanes 1 and 2). In lane 1, the concentration of RNA was 2 μg · μl−1; in lane 2, it was 0.2 μg · μl−1. The control reaction (C) without reverse transcriptase confirmed the absence of products derived from contaminated DNA.
