1Y7L:
reference: The active site of O-acetylserine sulfhydrylase is the anchor point for bienzyme complex formation with serine acetyltransferase., Huang B, Vetting MW, Roderick SL, J Bacteriol. 2005 May;187(9):3201-5. PMID: 15838047

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