3SN2:
reference: Accommodating variety in iron-responsive elements: Crystal structure of transferrin receptor 1 B IRE bound to iron regulatory protein 1., Walden WE, Selezneva A, Volz K, FEBS Lett. 2012 Jan 2;586(1):32-5. Epub 2011 Nov 24. PMID: 22119729

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