3HGT:
reference: Structural and Functional Studies of the Yeast Class II Hda1 Histone Deacetylase Complex., Lee JH, Maskos K, Huber R, J Mol Biol. 2009 Aug 28;391(4):744-57. Epub 2009 Jun 30. PMID: 19573535

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