3WI1:
reference: Conformational Polymorphism of m(7)GTP in Crystal Structure of the PB2 Middle Domain from Human Influenza A Virus., Tsurumura T, Qiu H, Yoshida T, Tsumori Y, Hatakeyama D, Kuzuhara T, Tsuge H, PLoS One. 2013 Nov 29;8(11):e82020. doi: 10.1371/journal.pone.0082020. PMID: 24312396

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