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Left: The KcsA potassium ion channel and a schematic of the knock-on (top) and hard-knock (bottom) ion transport mechanisms. Right:(a) The experimental IR spectrum in the isotope labeled region and (b) the simulated 2D IR spectrum of the knock-on model. Reproduced with permission from refs 4 and 74. Copyright 2017 American Chemical Society and 2016 American Association for the Advancement of Science, respectively.
