4E22:
reference: Structure and function of cytidine monophosphate kinase from Yersinia pseudotuberculosis, essential for virulence but not for survival., Walker NJ, Clark EA, Ford DC, Bullifent HL, McAlister EV, Duffield ML, Acharya KR, Oyston PC, Open Biol. 2012 Dec 5;2(12):120142. doi: 10.1098/rsob.120142. Print 2012. PMID: 23271832

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