Additional file 3: Figure S2. Glutamate/GABA conversion by Bifidobacterium recombinant strains, B. longum 105-A (lon.), B. longum subspecies infantis JCM 1222 (inf.), and B. minimum JCM 5821 (min.), each cloned with three promoters. The promoter names are displayed under the corresponding strains. Glutamate and GABA concentrations are presented in g/L. Values are presented as the means ± SD. Analysis was performed using three independent bacterial cultures.