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. 2019 May 20;18:86. doi: 10.1186/s12934-019-1135-8

Fig. 4.

Fig. 4

SEM micrographs of E. coli strains and tolerance test at 6 h in presence or absence of different concentrations of precursor. a SEM images for the wild type, the selected mutants and the double mutant strains overexpressing NfsB. b Growth tolerance test of the genetic backgrounds of these strains (without pBAD-NfsB) in presence of increasing concentrations of precursor