To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S5. Internal density gradient variations within the crown structure Top- and side-view animation showing internal density gradient variations within the crown indicative of secondary structure features. Subdomain cryo-EM structure of nodaviral replication protein A crown complex provides mechanistic insights into RNA genome replication Nuruddin Unchwaniwala, Hong Zhan, Janice Pennington, Mark Horswill, Johan A. den Boon, and Paul Ahlquist PNAS. 2020. 117:18680-18691 DOI: 10.1073/pnas.2006165117 Download Original Video Browse All Videos »