Figure 3

Reporter assays of Placq-Lacltandem-GFP. The results show the changes in the fluorescence intensities of the cultures with pSB-GFP, Placq-GFP, or Placq-Lacltandem-GFP dependent on the input of 1 mM IPTG. Cells were cultured for 8 hours after the induction. In the presence of IPTG, the culture with Placq-Lacltandem-GFP showed 3.5-fold higher fluorescence intensity than that in the absence of IPTG. The culture with pSB-GFP, which does not express GFP, was used as a negative control. The culture with Placq-GFP, which constitutively expresses GFP, was used as a positive control. The assays were performed in triplicate. Error bars indicate the standard deviation.