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A. In vitro transcription assays with yrbL PE derivatives. Red, consensus PE bases.
B. Schematic representation of TEC in pre-translocated state at consensus PE (top) and TEC in post-translocated state at consensus PE (bottom). White boxes, DNA; gray boxes, RNA; gray shading, RNAP; red, consensus PE bases; i and i+1, RNAP active-center i and i+1 sites.
