2RF7:
reference: Role of a Conserved Glutamine Residue in Tuning the Catalytic Activity of Escherichia coli Cytochrome c Nitrite Reductase., Clarke TA, Kemp GL, Wonderen JH, Doyle RM, Cole JA, Tovell N, Cheesman MR, Butt JN, Richardson DJ, Hemmings AM, Biochemistry. 2008 Mar 25;47(12):3789-3799. Epub 2008 Mar 1. PMID: 18311941

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