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Permeation free energy profiles for sodium cation along the channel axis for the proposed open state +3 by applying all the AMBER force field (solid), the AMBER protein force field combined with the CHARMM ion force field (dotted), the AMBER force field with enhanced greater protein backbone flexibility (dashed), and the AMBER force field with a thicker water layer (dot-dashed). The reduced model was used in all simulations here.
