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Summary of HO• footprints of the RNAP–Pcr complexes at 37°C. The schematized protection pattern corresponds to the footprinting experiment in Supplementary Figure S4. Promoter positions relative to the transcription start site are indicated. Protections are shown by brackets. Protections denoted by the same letter in both strands lie across the minor groove of the DNA. Enhancements are shown by arrows.
