Fig. 2From: Escherichia coli σ70 promoters allow expression rate control at the cellular level in genome-integrated expression systemsPromoter activities of different promoter/operator combinations, under non-induced (0 mM IPTG) and induced (0.5 mM IPTG) conditions. The specific fluorescence of the reporter protein, GFPmut3.1 (YP/X), is given in relative fluorescence units per mg of cell dry matter [rfu/mg CDM]. This value was used to characterize a genome-integrated expression systems and b plasmid-based expression systems. Error bars indicate standard error of the mean (n = 3). Expression system names are defined in Fig. 1Back to article page