1BUN:
reference: Structure of beta 2-bungarotoxin: potassium channel binding by Kunitz modules and targeted phospholipase action., Kwong PD, McDonald NQ, Sigler PB, Hendrickson WA, Structure 1995 Oct 15;3(10):1109-19. PMID: 8590005

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