4EWC:
reference: The crystal structure and RNA-binding of an orthomyxovirus nucleoprotein., Zheng W, Olson J, Vakharia V, Tao YJ, PLoS Pathog. 2013 Sep;9(9):e1003624. doi: 10.1371/journal.ppat.1003624. Epub 2013, Sep 12. PMID: 24068932

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