2HZC:
reference: Alternative Conformations at the RNA-binding Surface of the N-terminal U2AF(65) RNA Recognition Motif., Thickman KR, Sickmier EA, Kielkopf CL, J Mol Biol. 2007 Feb 23;366(3):703-10. Epub 2006 Dec 2. PMID: 17188295

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