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The excess free energy per peptide (relative to the adsorbed state) in a tetrameric pore, as a function of the interhelical distance and the pore radius, for six values of the peptide charge: zp = 1,…,6. (Top panel) The electrostatic interaction free energy. (Bottom panel) The total excess free energy. The solid squares mark the equilibrium positions; the membrane perturbation force is τmp = 1 kBT/Å; n0 = 0.1 M, α = 120°.
