“Structural studies of Chikungunya virus maturation”
Moh Lan Yap, Thomas Klose, Akane Urakami, S. Saif Hasan, Wataru Akahata, and Michael G. Rossmann

http://www.pnas.org/content/early/2017/11/29/1713166114.abstract?sid=89ef6c8b-994e-400d-af12-3726d0d40bbc