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The structures of the TIC from the pyrBI promoter. Structures of the RNAP–pyrBI promoter complex (pyrBI-RPO, A) and TIC (pyrBI-TIC, B). RNA and tDNA are shown as stick models and the σ finger is depicted as a ribbon model. The Mg ions bound at the active site of RNAP are shown as yellow spheres. Schematic representations of the pyrBI-RPO (left) and pyrBI-TIC (right) are shown in lower panels.
