4JTC:
reference: Structure of a pore-blocking toxin in complex with a eukaryotic voltage-dependent K(+) channel., Banerjee A, Lee A, Campbell E, Mackinnon R, Elife. 2013 May 21;2:e00594. doi: 10.7554/eLife.00594. Print 2013. PMID: 23705070

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