5TJS:
reference: Isomer Activation Controls Stereospecificity of Class I Fructose-1,6-bisphosphate Aldolases., Heron PW, Sygusch J, J Biol Chem. 2017 Sep 27. pii: jbc.M117.811034. doi: 10.1074/jbc.M117.811034. PMID: 28972169

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