1FY7:
reference: Crystal structure of yeast Esa1 suggests a unified mechanism for catalysis and substrate binding by histone acetyltransferases., Yan Y, Barlev NA, Haley RH, Berger SL, Marmorstein R, Mol Cell 2000 Nov;6(5):1195-205. PMID: 11106757

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