2QUD:
reference: Structural basis for the coevolution of a viral RNA-protein complex., Chao JA, Patskovsky Y, Almo SC, Singer RH, Nat Struct Mol Biol. 2008 Jan;15(1):103-5. Epub 2007 Dec 9. PMID: 18066080

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