| 3Q9O: reference: The 1.8 angstrom cholix toxin crystal structure in complex with NAD and evidence for a new kinetic model., Fieldhouse RJ, Jorgensen R, Lugo MR, Merrill AR, J Biol Chem. 2012 Apr 25. PMID: 22535961 |
This OCA 
Structure page
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(documentation).