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Regulation of the pra operon promoter activity by PraR. (A) Schematic representation of pPZAR and pPZA. (B) Promoter activities of the pra operon were measured in E. coli cells harboring pPZAR (shaded bars) or pPZA (open bars). These cells were grown in LB medium with or without 10 mM 4HB or PCA. Each value is the average ± standard deviation (error bars) based on at least three independent experiments.
