1ET8:
reference: Catalytic roles for two water bridged residues (Asp-98 and His-255) in the active site of copper-containing nitrite reductase., Boulanger MJ, Kukimoto M, Nishiyama M, Horinouchi S, Murphy ME, J Biol Chem 2000 Aug 4;275(31):23957-64. PMID: 10811642

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