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Growth of evolved MM294 strains in the presence of DMF. Evolved MM294 bacteria cured of the mutator or control plasmid were grown for 16 h in LB medium containing various concentrations of DMF (initial culture). Subsequently, cultures obtained with DMF at 80 g/liter were used as the seed for a second set of cultures in the same media. OD620, optical density at 620 nm.
