5UAS:
reference: New Ulvan-Degrading Polysaccharide Lyase Family: Structure and Catalytic Mechanism Suggests Convergent Evolution of Active Site Architecture., Ulaganathan T, Boniecki MT, Foran E, Buravenkov V, Mizrachi N, Banin E, Helbert W, Cygler M, ACS Chem Biol. 2017 Mar 23. doi: 10.1021/acschembio.7b00126. PMID: 28290654

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