4UO6:
reference: Recent evolution of equine influenza and the origin of canine influenza., Collins PJ, Vachieri SG, Haire LF, Ogrodowicz RW, Martin SR, Walker PA, Xiong X, Gamblin SJ, Skehel JJ, Proc Natl Acad Sci U S A. 2014 Jul 14. pii: 201406606. PMID: 25024224

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