1PTA:
reference: Three-dimensional structure of phosphotriesterase: an enzyme capable of detoxifying organophosphate nerve agents., Benning MM, Kuo JM, Raushel FM, Holden HM, Biochemistry 1994 Dec 20;33(50):15001-7. PMID: 7999757

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