1AYZ:
reference: Crystal structure of the Saccharomyces cerevisiae ubiquitin-conjugating enzyme Rad6 at 2.6 A resolution., Worthylake DK, Prakash S, Prakash L, Hill CP, J Biol Chem 1998 Mar 13;273(11):6271-6. PMID: 9497353

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