Fig. 7From: Multivariate modular metabolic engineering for enhanced l-methionine biosynthesis in Escherichia coliOverview of the strain engineering process. The l-methionine titer was significantly improved by metabolic engineering, from 0.58 g/L in the MET2 strain to 21.28 g/L in the final strain MET17. ND, not detectedBack to article page