2I2A:
reference: NAD kinases use substrate-assisted catalysis for specific recognition of NAD., Poncet-Montange G, Assairi L, Arold S, Pochet S, Labesse G, J Biol Chem. 2007 Nov 23;282(47):33925-34. Epub 2007 Aug 8. PMID: 17686780

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