4JB1:
reference: Substrate Channel Flexibility in MurB Accommodates Two Distinct Substrates., Chen MW, Lohkamp B, Schnell R, Lescar J, Schneider G, PLoS One. 2013 Jun 21;8(6):e66936. Print 2013. PMID: 23805286

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