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DNA contour length distributions of bare DNA (top panel) and RPo complexes (bottom panel). (A) rrnB P1 promoter without ppGpp. (B) rrnB P1 promoter with 200 μM ppGpp. (C) λ pR promoter without ppGpp. (D) λ pR promoter with 200 μM ppGpp. The DNA compaction is shown as the difference between the mean values of the fitted Gaussian functions ± SEM. A schematic representation of the DNA templates used is drawn at the top.
