| 2A31: reference: NMR and crystallographic characterization of adventitious borate binding by trypsin., Transue TR, Gabel SA, London RE, Bioconjug Chem. 2006 Mar-Apr;17(2):300-8. PMID: 16536459 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).