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The intermolecular forces for DNA condensed by the series R3ANR3 are separated into their repulsive and attractive components. In A, the osmotic pressure contributions from the 2.4 Å decay length repulsion, ΠR, at 25 Å and from the 4.8 Å decay length attraction, ΠA, at 25 Å are shown as dependent on the number of alanines inserted. In B, the dependence of the free energy contributions, ΔGR and ΔGA, at 25 Å, calculated from Equations 4 and 5, on the number of alanines is shown.
