FIG. 3.

ipdC promoter driven β-glucuronidase activity in E. cloacae J55 (░⃞) and E. cloacae J51 (□) in stationary phase. Bacteria were grown for 44 h in M9 glucose minimal medium with 200 μg of l-tryptophan, l-phenylalanine, or l-tyrosine/ml or in the absence of exogenously supplied aromatic amino acids. The data shown are the averages of three independent replicates, and error bars represent the standard errors of the mean.