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The electrostatic free energy ΔG (upper panels) and the Mg2+ and Na+ (or K+) binding fractions per nucleotide (lower panel) for various RNA tertiary structures: (a) BWYV pseudoknot fragment, (b) 58-nt rRNA fragment, (c) Yeast tRNAPhe. (d) 40-bp RNA duplex. The corresponding experimental data are from Refs.13,53–55 respectively. In the lower panels, the black symbols are the experimental data and solid lines are the predicted results.
