2PGG:
reference: The structure of a birnavirus polymerase reveals a distinct active site topology., Pan J, Vakharia VN, Tao YJ, Proc Natl Acad Sci U S A. 2007 May 1;104(18):7385-90. Epub 2007 Apr 24. PMID: 17456597

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