1YFZ:
reference: Alternative IMP Binding in Feedback Inhibition of Hypoxanthine-Guanine Phosphoribosyltransferase from Thermoanaerobacter tengcongensis., Chen Q, Liang Y, Su X, Gu X, Zheng X, Luo M, J Mol Biol 2005 May 20;348(5):1199-210. Epub 2005 Apr 7. PMID: 15854655

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