1TIP:
reference: Crystal structure of a trapped phosphoenzyme during a catalytic reaction., Lee YH, Olson TW, Ogata CM, Levitt DG, Banaszak LJ, Lange AJ, Nat Struct Biol 1997 Aug;4(8):615-8. PMID: 9253407

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