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Transcriptional organization of the Ybt locus under the control of Fur and YbtA. Shown is the Fur/YbtA regulatory network consisting of the Fur and YbtA regulator plus the four operons of HPI. Transcription and/or translational start sites, core promoter region (−10 and −35 elements), and Fur/YbtA sites are depicted for each promoter to give a map of Fur/YbtA-DNA interactions within the HPI.
