1ZDF:
reference: Requirements for catalysis in Mammalian glycogenin., Hurley TD, Stout S, Miner E, Zhou J, Roach PJ, J Biol Chem 2005 Jun 24;280(25):23892-9. Epub 2005 Apr 22. PMID: 15849187

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