6DZ1:
reference: Anomalous X-ray diffraction studies of ion transport in K(+) channels., Langan PS, Vandavasi VG, Weiss KL, Afonine PV, El Omari K, Duman R, Wagner A, Coates L, Nat Commun. 2018 Oct 31;9(1):4540. doi: 10.1038/s41467-018-06957-w. PMID: 30382100

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