3I9M:
reference: Structural basis for enzymatic evolution from a dedicated ADP-ribosyl cyclase to a multi- functional NAD hydrolase., Liu Q, Graeff R, Kriksunov IA, Jiang H, Zhang B, Oppenheimer N, Lin H, Potter BV, Lee HC, Hao Q, J Biol Chem. 2009 Jul 28. PMID: 19640846

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