2WGH: Human Ribonucleotide Reductase R1 Subunit (Rrm1) In Complex With Datp And Mg.
reference: Structural basis for allosteric regulation of human ribonucleotide reductase by nucleotide-induced oligomerization., Fairman JW, Wijerathna SR, Ahmad MF, Xu H, Nakano R, Jha S, Prendergast J, Welin RM, Flodin S, Roos A, Nordlund P, Li Z, Walz T, Dealwis CG, Nat Struct Mol Biol. 2011 Mar;18(3):316-22. Epub 2011 Feb 20. PMID: 21336276

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).