2HJF:
reference: Mechanism of Intracellular Block of the KcsA K(+) Channel by Tetrabutylammonium: Insights from X-ray Crystallography, Electrophysiology and Replica-exchange Molecular Dynamics Simulations., Faraldo-Gomez JD, Kutluay E, Jogini V, Zhao Y, Heginbotham L, Roux B, J Mol Biol. 2006 Sep 29;. PMID: 17070844

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