| 5UGI: reference: An Activator-Blocker Pair Provides a Controllable On-Off Switch for a Ketosteroid Isomerase Active Site Mutant., Lamba V, Yabukarski F, Herschlag D, J Am Chem Soc. 2017 Aug 16;139(32):11089-11095. doi: 10.1021/jacs.7b03547. Epub, 2017 Aug 2. PMID: 28719738 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).