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. 2010 Jan 6;98(1):111–120. doi: 10.1016/j.bpj.2009.09.057

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The folding free energy ΔG in k_BT of the RNA three-way junction as a function of (A) Na⁺ concentration and (B) Mg²⁺ concentration (with 0.05 M Na⁺ background) for the different structural parameters d_Y and d_y (see Supporting Material I and Fig. 7A). The two parameters are simultaneously increased or decreased, but we keep the same ratio of the radius of gyration R_g(Y)/R_g(y) between the folded (y) and the unfolded (Y) states.