| 5L21: reference: A camelid single-domain antibody neutralizes botulinum neurotoxin A by blocking host receptor binding., Yao G, Lam KH, Weisemann J, Peng L, Krez N, Perry K, Shoemaker CB, Dong M, Rummel A, Jin R, Sci Rep. 2017 Aug 7;7(1):7438. doi: 10.1038/s41598-017-07457-5. PMID: 28785006 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).