4ZWI:
reference: Observed Surface Lysine Acetylation of Human Carbonic Anhydrase II Expressed in Escherichia Coli., Mahon BP, Lomelino CL, Salguero AL, Driscoll JM, Pinard MA, McKenna R, Protein Sci. 2015 Aug 12. doi: 10.1002/pro.2771. PMID: 26266677

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