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Expression of citM in CcpA-deficient cells grown in fresh and spent LBC medium. Strain CM010 was grown in fresh LBC medium (• and ○), spent LBC medium (▾ and ▿), and spent LBC medium plus 2.6 mM l-arginine (▪ and □). Samples were taken at the indicated time points to monitor β-galactosidase activity in Miller units (MU) (solid symbols) and growth (open symbols), measured as OD660.
