2GQU:
reference: Crystal structure of UDP-N-acetylenolpyruvylglucosamine reductase (MurB) from Thermus caldophilus., Kim MK, Cho MK, Song HE, Kim D, Park BH, Lee JH, Kang GB, Kim SH, Im YJ, Lee DS, Eom SH, Proteins. 2006 Nov 21;. PMID: 17120230

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