Figure 4.
DNA folding occurs even at short DNA lengths. (A) Plots of the rolling standard deviation, σx, at each protamine concentration over time for three individual 25-nm-length DNA tethers and three individual 50-nm-length DNA tethers. A decrease in σx indicates DNA folding. Data is at 0.1 Hz. (B) Histograms of σx peaks for all of the 25-nm-length and 50-nm-length DNA tethers. Histograms at each protamine concentration are stacked one on top of the other. Color scheme is the same as Figure 2.