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The biological activity of many nitrosubstituted compounds, many of which are produced commercially or have been identified as environmental contaminants, is dependent on metabolic activation catalyzed by nitroreductases. In the current study, we have cloned a nitroreductase gene, Salmonella typhimurium nitroreductase A (snrA), from S. enterica serovar Typhimurium strain TA1535, and characterized...