| 4LFS: reference: Native Chemical Ligation at Asx-Cys, Glx-Cys: Chemical Synthesis and High-Resolution X-ray Structure of ShK Toxin by Racemic Protein Crystallography., Dang B, Kubota T, Mandal K, Bezanilla F, Kent SB, J Am Chem Soc. 2013 Aug 6. PMID: 23919482 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).