2JWZ:
reference: Mutations in the hydrophobic core of ubiquitin differentially affect its recognition by receptor proteins., Haririnia A, Verma R, Purohit N, Twarog MZ, Deshaies RJ, Bolon D, Fushman D, J Mol Biol. 2008 Jan 25;375(4):979-96. Epub 2007 Nov 13. PMID: 18054791

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