2YJG:
reference: Lactate racemase is a nickel-dependent enzyme activated by a widespread maturation system., Desguin B, Goffin P, Viaene E, Kleerebezem M, Martin-Diaconescu V, Maroney MJ, Declercq JP, Soumillion P, Hols P, Nat Commun. 2014 Apr 7;5:3615. doi: 10.1038/ncomms4615. PMID: 24710389

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