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Comparison of the selectivity filter structures of NaK and KcsA and between various ion complexes of NaK. a) Superimposition of the NaK selectivity filter (yellow) in complex with K+ with that of KcsA (green, PDB code 1K4C). b) Superimposition of the selectivity filters of the NaKNΔ19 channel in complex with Na+ (yellow), K+ (green), and Rb+ (orange).
