4DQJ:
reference: Selective pressure causes an RNA virus to trade reproductive fitness for increased structural and thermal stability of a viral enzyme., Dessau M, Goldhill D, McBride R, Turner PE, Modis Y, PLoS Genet. 2012;8(11):e1003102. doi: 10.1371/journal.pgen.1003102. Epub 2012 Nov, 29. PMID: 23209446

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