3AQA:
reference: Real-Time Imaging of Histone H4K12-Specific Acetylation Determines the Modes of Action of Histone Deacetylase and Bromodomain Inhibitors., Ito T, Umehara T, Sasaki K, Nakamura Y, Nishino N, Terada T, Shirouzu M, Padmanabhan B, Yokoyama S, Ito A, Yoshida M, Chem Biol. 2011 Apr 22;18(4):495-507. PMID: 21513886

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