3FI1:
reference: Conformations of NhaA, the Na/H exchanger from Escherichia coli, in the pH-activated and ion-translocating states., Appel M, Hizlan D, Vinothkumar KR, Ziegler C, Kuhlbrandt W, J Mol Biol. 2009 Feb 20;386(2):351-65. Epub 2008 Dec 25. PMID: 19135453

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