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The radial electrostatic force in a four-peptide pore as a function of the pore radius (R, bottom scale) and the interhelical separation (d, top scale) for different peptide charges, zp = 1,…,6. The horizontal dashed line marks the attractive force resulting from the line energy of the semitoroidal lipid rim, τmp = 1 kBT/Å. The crossing points of the force curves mark the equilibrium radii and are shown as a function of zp in the inset. In these calculations, n0 = 0.1 M and α = 120°.
