Additional file 3: Fig. S3. Schematic overview of the influence of overexpression of Umag_ria1, Uc_ria1, Pt_ria1 and Si_ria1, on itatartarate (ITT) production. Differences in itatartarate production were determined after 120 h or 384 h System Duetz® cultivations in screening medium containing glucose or glycerol, respectively