| 3QDQ: reference: Crystal structure of the complex between 4-hydroxybutyrate CoA-transferase from Clostridium aminobutyricum and CoA., Macieira S, Zhang J, Buckel W, Messerschmidt A, Arch Microbiol. 2011 Aug 11. PMID: 21833509 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).