2NYY:
reference: Molecular evolution of antibody cross-reactivity for two subtypes of type A botulinum neurotoxin., Garcia-Rodriguez C, Levy R, Arndt JW, Forsyth CM, Razai A, Lou J, Geren I, Stevens RC, Marks JD, Nat Biotechnol. 2006 Dec 17;. PMID: 17173035

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