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(a) Acetate secretion of E. coli W3110 and four PTSGlc mutants in the mineral medium supplied with 20 g l−1 glucose under aerobic conditions. The pH was not controlled. (b) Distribution of the metabolites of E. coli W3110 and four PTSGlc mutants under anaerobic conditions. A P value of <0.05 was considered statistically significant. Different letters above the bars indicate significant differences (P < 0.05).
