Fig. 6From: Fermentative production of the unnatural amino acid l-2-aminobutyric acid based on metabolic engineeringRegulating the expression of ilvA* and leuDH for l-ABA titer. a Relative fluorescence intensity (au/OD600) of eGFP harbored in different promoters. b Effect of promoters with different strengths on l-ABA titerBack to article page