1WAE:
reference: Observation of an unprecedented Cu Bis-His site: crystal structure of the H129V mutant of nitrite reductase., Ellis MJ, Antonyuk SV, Strange RW, Sawers G, Eady RR, Hasnain SS, Inorg Chem. 2004 Nov 29;43(24):7591-3. PMID: 15554622

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