3MJO:
reference: A tyrosyl-dimanganese coupled spin system is the native metalloradical cofactor of the R2F subunit of the ribonucleotide reductase of Corynebacterium ammoniagenes., Cox N, Ogata H, Stolle P, Reijerse E, Auling G, Lubitz W, J Am Chem Soc. 2010 Aug 18;132(32):11197-213. PMID: 20698687

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