1NNO:
reference: Conformational changes occurring upon reduction and NO binding in nitrite reductase from Pseudomonas aeruginosa., Nurizzo D, Cutruzzola F, Arese M, Bourgeois D, Brunori M, Cambillau C, Tegoni M, Biochemistry 1998 Oct 6;37(40):13987-96. PMID: 9760233

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