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. 2005 Nov 15;102(48):17348–17353. doi: 10.1073/pnas.0508584102

Fig. 4.

Fig. 4.

Effects of ionic strength on ssDNA flexibility. (a) Extracted persistence length, lP, vs. ionic strength ([NaCl] + [Tris buffer]) for (dT)30 (red circles), (dT)40 (purple circles), and (dT)50 (cyan circles). Solid red, purple, and cyan lines: respective fits to model, Inline graphic with constant, intrinsic persistence length Inline graphic and electrostatic contribution Inline graphic. Dotted lines: respective fits to model, Inline graphic, where the electrostatic contribution varies as Inline graphic. (b) Residuals plotted for fits in a. Fits were weighted by using error value averaged over all data points.