6CPV:
reference: MicroED structure of the NaK ion channel reveals a Na(+) partition process into the selectivity filter., Liu S, Gonen T, Commun Biol. 2018;1:38. doi: 10.1038/s42003-018-0040-8. Epub 2018 May 3. PMID: 30167468

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).