1MRR:
reference: Substitution of manganese for iron in ribonucleotide reductase from Escherichia coli. Spectroscopic and crystallographic characterization., Atta M, Nordlund P, Aberg A, Eklund H, Fontecave M, J Biol Chem 1992 Oct 15;267(29):20682-8. PMID: 1328209

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