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Regulation of the prpBCDE promoter by glucose or glycerol in cells expressing PrpR. E. coli JSW1 strains harboring the PprpBCDE-rfp reporter with no extra copy of prpR (pZBR, black bars) or the PprpBCDE-rfp reporter and prpR under the control of Pzt1 (pZBRR, hatched bars) were grown in LB medium plus 0.4% glucose (Glc) or glycerol (Gly) with 10 mM propionate (Prop) or 5 ng of TC per ml.
