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Comparison of metal-binding sites in class Ib (A) (PDB accession code3N3A), class Ic (B) (PDB accession code4M1I), class Id (C) (PDB accession code6CWP), and class Ie RNR (D) (PDB accession code6EBO). Selected amino acids shown in stick format. MnII ions shown as purple spheres, FeII ions shown as orange spheres. Coordination interactions or hydrogen bonds shown as dashed lines. Water molecules shown as red spheres.
