2C9X:
reference: Kinetic and structural evidence for the importance of Tyr236 for the integrity of the Mo active site in a bacterial sulfite dehydrogenase., Kappler U, Bailey S, Feng C, Honeychurch MJ, Hanson GR, Bernhardt PV, Tollin G, Enemark JH, Biochemistry. 2006 Aug 15;45(32):9696-705. PMID: 16893171

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