2JX5:
reference: Sequence and structure evolved separately in a ribosomal ubiquitin variant., Catic A, Sun ZY, Ratner DM, Misaghi S, Spooner E, Samuelson J, Wagner G, Ploegh HL, EMBO J. 2007 Jul 25;26(14):3474-83. Epub 2007 Jun 28. PMID: 17599068

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