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norA expression by β-galactosidase assay. (A) SA-K2124, wild-type norA promoter; SA-K2173, inverted repeat mutant; SA-K2242, TTAATT consensus sequence mutant; SA-K2161, flqB (T→A) mutant. (B) Filled and open bars represent the indicated strain with pCU1 or pK404 (pCU1-mgrA), respectively. Data represent the means of the results from three experiments ± standard deviations. NS, not significant.
