1N15:
reference: Does the reduction of c heme trigger the conformational change of crystalline nitrite reductase?, Nurizzo D, Cutruzzola F, Arese M, Bourgeois D, Brunori M, Cambillau C, Tegoni M, J Biol Chem 1999 May 21;274(21):14997-5004. PMID: 10329702

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