1B3C:
reference: Solution structure of a beta-neurotoxin from the New World scorpion Centruroides sculpturatus Ewing., Jablonsky MJ, Jackson PL, Trent JO, Watt DD, Krishna NR, Biochem Biophys Res Commun 1999 Jan 19;254(2):406-12. PMID: 9918851

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