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Growth curves of E. coli. E. coli harboring plasmid pKK1819, pKK1819S, pKK70, or pKK232-8 was cultivated in LB medium containing ampicillin or LB medium containing both ampicillin and chloramphenicol (Ch). The standard deviation of the value at each time point was obtained from triplicates of one experiment. OD, optical density.
