1LBE:
reference: Crystal structure of Aplysia ADP ribosyl cyclase, a homologue of the bifunctional ectozyme CD38., Prasad GS, McRee DE, Stura EA, Levitt DG, Lee HC, Stout CD, Nat Struct Biol 1996 Nov;3(11):957-64. PMID: 8901875

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