4UPD:
reference: Crystal structures of Ophiostoma piceae sterol esterase: Structural insights into activation mechanism and product release., Gutierrez-Fernandez J, Vaquero ME, Prieto A, Barriuso J, Martinez MJ, Hermoso JA, J Struct Biol. 2014 Sep;187(3):215-22. doi: 10.1016/j.jsb.2014.07.007. Epub 2014 , Aug 7. PMID: 25108239

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).