3N7J:
reference: Identification of a Unique Ganglioside Binding Loop within Botulinum Neurotoxins C and D-SA ., Karalewitz AP, Kroken AR, Fu Z, Baldwin MR, Kim JJ, Barbieri JT, Biochemistry. 2010 Aug 23. PMID: 20731382

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