Fig. 4From: Regulating the T7 RNA polymerase expression in E. coli BL21 (DE3) to provide more host options for recombinant protein productionTunable expression of GDH and three membrane proteins in three engineered strains and control strain BL21 (DE3) under different inducer concentrations at 36Â h. A Tunable expression of GDH. B Tunable expression of Codb. C Tunable expression of Ecb. D Tunable expression of Yidc. Values and error bars represent the means and the deviations from triplicate experimentsBack to article page