2EVY:
reference: A GCUA tetranucleotide loop found in the poliovirus oriL by in vivo SELEX (un)expectedly forms a YNMG-like structure: Extending the YNMG family with GYYA., Melchers WJ, Zoll J, Tessari M, Bakhmutov DV, Gmyl AP, Agol VI, Heus HA, RNA. 2006 Sep;12(9):1671-82. Epub 2006 Aug 7. PMID: 16894217

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