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Free energy landscape of the permeation process for K+/Na+/K+ (Val76-flip filter) A & C) Two 2-dimensional views of the computed PMF for conduction of an Na+ ion chaperoned by two K+, in the style of Berneche and Roux (21), overlaid with computed minimum-energy pathway. B) Representative snapshots of five numbered points along the pathway, corresponding to local minima along the pathway.
