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. 2020 May 11;48(11):6108–6119. doi: 10.1093/nar/gkaa365

Figure 2.

Figure 2.

DNA loops folded by protamine have ∼20 nm diameters. (Left) Images of DNA loops folded by protamine. DNA length, L, is either 105 nm or 217 nm. Computer algorithm calculates the loop diameter d (see Materials and Methods). Width of images is 200 nm. (Right) Histograms of the loop diameter at different protamine concentrations (gray = no protamine, yellow = 0.2 μM, blue = 0.6 μM, and purple = 2 μM protamine). Histograms are stacked. Mean loop diameter for 105-nm-length DNA is 20 nm (dotted line).