1WQK:
reference: Solution structure of APETx1 from the sea anemone Anthopleura elegantissima: A new fold for an HERG toxin., Chagot B, Diochot S, Pimentel C, Lazdunski M, Darbon H, Proteins 2005 Feb 22;. PMID: 15726634

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