1AQO:
reference: Structure and dynamics of the iron responsive element RNA: implications for binding of the RNA by iron regulatory binding proteins., Addess KJ, Basilion JP, Klausner RD, Rouault TA, Pardi A, J Mol Biol 1997 Nov 21;274(1):72-83. PMID: 9398517

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