4NP7:
reference: A 5000-fold increase in the specificity of a bacterial phosphotriesterase for malathion through combinatorial active site mutagenesis., Naqvi T, Warden AC, French N, Sugrue E, Carr PD, Jackson CJ, Scott C, PLoS One. 2014 Apr 10;9(4):e94177. doi: 10.1371/journal.pone.0094177. eCollection, 2014. PMID: 24721933

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