1KCB:
reference: Crystal structure of a NO-forming nitrite reductase mutant: an analog of a transition state in enzymatic reaction., Liu SQ, Chang T, Liu MY, LeGall J, Chang WC, Zhang JP, Liang DC, Chang WR, Biochem Biophys Res Commun 2003 Mar 14;302(3):568-74. PMID: 12615072

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