Fig. 1

GABA production and GAD activity of gadB2-expressing C. glutamicum strains under different RBS sequences. a Glu concentration, b GABA concentration, c GAD activity. White bars at 36 h, black bars at 72 h, grey bars at 40 h. H high level of GABA, M medium level of GABA, L low level of GABA. Each point represents the average of three independent experiments