3E90:
reference: Structure of West Nile Virus NS3 Protease: Ligand Stabilization of the Catalytic Conformation., Robin G, Chappell K, Stoermer MJ, Hu SH, Young PR, Fairlie DP, Martin JL, J Mol Biol. 2008 Nov 25. PMID: 19059417

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