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T/F? The KcsA potassium channel has a selectivity filter where loops in the polypeptide backbone are arranged in such a way that they are in the perfect orientation for their carbonyl groups to ionically bond/interact with two potassium ions vertically in the filter, because they fit the radius of the K+ ions, but not any other larger ions, preventing larger ions from entering. In addition, the presence of the K+ ions in the filter, repels smaller ions like Na+ from entering the channel.
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