1R9I:
reference: Solution structure of mu-conotoxin PIIIA, a preferential inhibitor of persistent tetrodotoxin-sensitive sodium channels., Nielsen KJ, Watson M, Adams DJ, Hammarstrom AK, Gage PW, Hill JM, Craik DJ, Thomas L, Adams D, Alewood PF, Lewis RJ, J Biol Chem 2002 Jul 26;277(30):27247-55. Epub 2002 May 2. PMID: 12006587

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