4QK3:
reference: Structural and Catalytic Effects of Proline Substitution and Surface Loop Deletion in the Extended Active Site of Human Carbonic Anhydrase II., Boone CD, Rasi V, Tu C, McKenna R, FEBS J. 2015 Feb 13. doi: 10.1111/febs.13232. PMID: 25683338

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