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. Author manuscript; available in PMC: 2008 Jul 14.
Published in final edited form as: J Chem Phys. 2005 Jan 22;122(4):44903. doi: 10.1063/1.1842059

FIG. 2.

FIG. 2

Illustration of (a) the electrostatic and (b)–(d) the excluded volume interactions between charges in the tightly bound region. Empty circles represent phosphate groups and the shaded circles represent the tightly bound ions.