Fig. 1

Growth of MU-11 (pKAR) and ten ALE samples in EFB media. The respective seeds for the ten samples were prepared by cultivating MU-11 (pKAR) overnight in LB medium with 10 g/L arabinose. Cells were then serially transferred in EFB media with lysine concentrations from low to high. At the fourth transfer, 10 g/L arabinose was added into the sample cultures again. For the cultivation of MU-11 (pKAR) as a control, arabinose was not used during the whole process. The inoculation ratio was 1%. The growth curves of the control groups were linked to highlight the growth differences between controls and mutants. Data for the growth of MU-11 (pKAR) are the mean and standard deviation of independent triplicates