2NM1:
reference: Botulinum neurotoxin B recognizes its protein receptor with high affinity and specificity., Jin R, Rummel A, Binz T, Brunger AT, Nature. 2006 Dec 21;444(7122):1092-5. Epub 2006 Dec 13. PMID: 17167421

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