5ELM:
reference: Structural basis for an atypical active site of an l-aspartate/glutamate-specific racemase from Escherichia coli., Ahn JW, Chang JH, Kim KJ, FEBS Lett. 2015 Dec 21;589(24 Pt B):3842-7. doi: 10.1016/j.febslet.2015.11.003., Epub 2015 Nov 7. PMID: 26555188

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