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(A) Single-molecule time traces for donor and acceptor FIs and FEs for the GC core at 37 °C, 1.4 pN, and σ = -0.013 (ΔLk = -15). (B) Dwell time histograms of the B-to-Z and Z-to-B transitions. Each histogram is well fitted to a single exponential curve (Blue) with a time constant τ.
