1Q2C:
reference: Structural basis for histone and phosphohistone binding by the GCN5 histone acetyltransferase., Clements A, Poux AN, Lo WS, Pillus L, Berger SL, Marmorstein R, Mol Cell 2003 Aug;12(2):461-73. PMID: 14536085

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