1EPW:
reference: Structural analysis of the catalytic and binding sites of Clostridium botulinum neurotoxin B., Swaminathan S, Eswaramoorthy S, Nat Struct Biol 2000 Aug;7(8):693-9. PMID: 10932256

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