5DK8:
reference: New crystal form of human ubiquitin in the presence of magnesium., Camara-Artigas A, Plaza-Garrido M, Martinez-Rodriguez S, Bacarizo J, Acta Crystallogr F Struct Biol Commun. 2016 Jan 1;72(Pt 1):29-35. doi:, 10.1107/S2053230X15023390. Epub 2016 Jan 1. PMID: 26750481

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