5Y4O:
reference: A binding-block ion selective mechanism revealed by a Na/K selective channel., Yu J, Zhang B, Zhang Y, Xu CQ, Zhuo W, Ge J, Li J, Gao N, Li Y, Yang M, Protein Cell. 2018 Jul;9(7):629-639. doi: 10.1007/s13238-017-0465-8. Epub 2017, Sep 18. PMID: 28921397

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