5W0G:
reference: Cancer-Associated Mutations Mapped on High-Resolution Structures of the U2AF2 RNA Recognition Motifs., Glasser E, Agrawal AA, Jenkins JL, Kielkopf CL, Biochemistry. 2017 Sep 12;56(36):4757-4761. doi: 10.1021/acs.biochem.7b00551., Epub 2017 Sep 1. PMID: 28850223

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