1XV5:
reference: Structural Evidence of a Passive Base-flipping Mechanism for AGT, an Unusual GT-B Glycosyltransferase., Lariviere L, Sommer N, Morera S, J Mol Biol 2005 Sep 9;352(1):139-50. PMID: 16081100

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