1WCS:
reference: A sialidase mutant displaying trans-sialidase activity., Paris G, Ratier L, Amaya MF, Nguyen T, Alzari PM, Frasch AC, J Mol Biol. 2005 Jan 28;345(4):923-34. PMID: 15588836

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