| 4HZ3: reference: The voltage-dependent gate in MthK potassium channels is located at the selectivity filter., Posson DJ, McCoy JG, Nimigean CM, Nat Struct Mol Biol. 2013 Feb;20(2):159-66. doi: 10.1038/nsmb.2473. Epub 2012 Dec, 23. PMID: 23262489 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).