3N0Y:
reference: Active-Site Structure of Class IV Adenylyl Cyclase and Transphyletic Mechanism., Gallagher DT, Kim SK, Robinson H, Reddy PT, J Mol Biol. 2011 Jan 21;405(3):787-803. Epub 2010 Nov 20. PMID: 21094652

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