1OX7:
reference: The 1.14 A crystal structure of yeast cytosine deaminase: evolution of nucleotide salvage enzymes and implications for genetic chemotherapy., Ireton GC, Black ME, Stoddard BL, Structure (Camb) 2003 Aug;11(8):961-72. PMID: 12906827

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