2PGJ:
reference: Catalysis-associated Conformational Changes Revealed by Human CD38 Complexed with a Non-hydrolyzable Substrate Analog., Liu Q, Kriksunov IA, Moreau C, Graeff R, Potter BV, Lee HC, Hao Q, J Biol Chem. 2007 Aug 24;282(34):24825-32. Epub 2007 Jun 25. PMID: 17591784

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