| 3D31: reference: Structural Basis of Trans-Inhibition in a Molybdate/tungstate ABC Transporter., Gerber S, Comellas-Bigler M, Goetz BA, Locher KP, Science. 2008 May 29;. PMID: 18511655 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).