4KW3:
reference: Structure of the NS1 protein N-terminal origin-recognition/nickase domain from the emerging human bocavirus., Tewary SK, Zhao H, Shen W, Qiu J, Tang L, J Virol. 2013 Aug 21. PMID: 23966383

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