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. 2018 Oct 31;9:4540. doi: 10.1038/s41467-018-06957-w

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© The Author(s) 2018

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Fig. 1 — Structure of the NaK2K ion channel protein. The four integral K⁺ binding sites within the ion channel of a K⁺ selective NaK2K (NaK D66Y and N68D) at a K⁺ ion concentration of 100 mM are shown as white spheres. For clarity one of the four subunits that make up the ion channel has been removed