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Recombination frequencies of E. coli strains mutant for suspected purine base analog-metabolizing enzymes upon HAP exposure. Early-log-phase cells were exposed to various concentrations of HAP for 1 h at 37°C. Each data point represents one bacterial culture. Symbols: ○, NEB123 (wild type); •, NEB124 (moa); □, NEB126 (moa rdgB); ▪, NEB127 (moa nfi); ▵, NEB128 (moa rdgB nfi); ▴, NEB125 (rdgB); ▿, NEB129 (rdgB nfi).
