1MXN:
reference: A new level of conotoxin diversity, a non-native disulfide bond connectivity in alpha-conotoxin AuIB reduces structural definition but increases biological activity., Dutton JL, Bansal PS, Hogg RC, Adams DJ, Alewood PF, Craik DJ, J Biol Chem 2002 Dec 13;277(50):48849-57. Epub 2002 Oct 9. PMID: 12376538

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