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We have designed and constructed a series of plasmids that contain the major and/or minor Escherichia coli nitroreductase genes, nfsA and nfsB, in different combinations with R plasmid mucA/B genes and the Salmonella typhimurium OAT gene. The plasmid encoded gene products are necessary for both the metabolic activation of a range of structurally diverse nitrosubstituted compounds, and for mutagenic...