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Binding selectivity of Ca2 + over Na+ and various advantage terms as functions of z for the indicated values of c Ca 2+(B) M. The other variables are held fixed: c Na +(B)=30 mM, R = 3.5 Å, and ϵpr = 10. The MFI, SCI, MFD, SCD, and SELF electrostatic terms are shown. Arrows indicate the direction in which Ca2 + concentration increases.
