2BHG:
reference: Crystal structure of foot-and-mouth disease virus 3C protease. New insights into catalytic mechanism and cleavage specificity., Birtley JR, Knox SR, Jaulent AM, Brick P, Leatherbarrow RJ, Curry S, J Biol Chem. 2005 Mar 25;280(12):11520-7. Epub 2005 Jan 14. PMID: 15654079

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