3DYC:
reference: Comparative enzymology in the alkaline phosphatase superfamily to determine the catalytic role of an active-site metal ion., Zalatan JG, Fenn TD, Herschlag D, J Mol Biol. 2008 Dec 31;384(5):1174-89. Epub 2008 Oct 2. PMID: 18851975

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