2VSY:
reference: Structural insights into mechanism and specificity of O-GlcNAc transferase., Clarke AJ, Hurtado-Guerrero R, Pathak S, Schuttelkopf AW, Borodkin V, Shepherd SM, Ibrahim AF, van Aalten DM, EMBO J. 2008 Oct 22;27(20):2780-8. Epub 2008 Sep 25. PMID: 18818698

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