1SMS:
reference: Structures of the yeast ribonucleotide reductase Rnr2 and Rnr4 homodimers., Sommerhalter M, Voegtli WC, Perlstein DL, Ge J, Stubbe J, Rosenzweig AC, Biochemistry 2004 Jun 22;43(24):7736-42. PMID: 15196016

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