2J3X:
reference: Structure and action of the binary C2 toxin from Clostridium botulinum., Schleberger C, Hochmann H, Barth H, Aktories K, Schulz GE, J Mol Biol. 2006 Dec 8;364(4):705-15. Epub 2006 Sep 5. PMID: 17027031

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