3BOK:
reference: Catalytic features of the botulinum neurotoxin a light chain revealed by high resolution structure of an inhibitory peptide complex., Silvaggi NR, Wilson D, Tzipori S, Allen KN, Biochemistry. 2008 May 27;47(21):5736-45. Epub 2008 May 6. PMID: 18457419

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