| 3BEU: reference: Engineering protein allostery: 1.05 A resolution structure and enzymatic properties of a Na+-activated trypsin., Page MJ, Carrell CJ, Di Cera E, J Mol Biol. 2008 May 2;378(3):666-72. Epub 2008 Mar 18. PMID: 18377928 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).