3UUS:
reference: Structural interconversions modulate activity of Escherichia coli ribonucleotide reductase., Ando N, Brignole EJ, Zimanyi CM, Funk MA, Yokoyama K, Asturias FJ, Stubbe J, Drennan CL, Proc Natl Acad Sci U S A. 2011 Dec 27;108(52):21046-51. Epub 2011 Dec 12. PMID: 22160671

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