3O7U:
reference: Three-dimensional structure and catalytic mechanism of Cytosine deaminase., Hall RS, Fedorov AA, Xu C, Fedorov EV, Almo SC, Raushel FM, Biochemistry. 2011 Jun 7;50(22):5077-85. Epub 2011 May 12. PMID: 21545144

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