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Mutator activity of wtPolIV and Ser42Ala mutant. The bar graph displays the number of colonies obtained on plates containing rifampicin (100 µg/ml) after overnight incubation (37°C) of a dinB deleted strain [dinB749(del)::kan] transformed with (i) pDJNNwtdb, (ii) pDJNNSER42ALAdb and (iii) empty vector.
