2Q1F:
reference: Composite Active Site of Chondroitin Lyase ABC Accepting Both Epimers of Uronic Acid., Shaya D, Hahn BS, Bjerkan TM, Kim WS, Park NY, Sim JS, Kim YS, Cygler M, Glycobiology. 2008 Jan 28;. PMID: 18227125

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