6EBK:
reference: Single-particle cryo-EM structure of a voltage-activated potassium channel in lipid nanodiscs., Matthies D, Bae C, Toombes GE, Fox T, Bartesaghi A, Subramaniam S, Swartz KJ, Elife. 2018 Aug 15;7. pii: 37558. doi: 10.7554/eLife.37558. PMID: 30109985

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