4BBL:
reference: The structure of native influenza virion ribonucleoproteins., Arranz R, Coloma R, Chichon FJ, Conesa JJ, Carrascosa JL, Valpuesta JM, Ortin J, Martin-Benito J, Science. 2012 Dec 21;338(6114):1634-7. doi: 10.1126/science.1228172. Epub 2012, Nov 22. PMID: 23180776

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