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a) Structure of the bi-Zn(II) form of CphA (PDB 3F9O). b) Structure of NDM-1 (PDB 3SPU, chain B). Zn(II) ions and water molecules / hydroxide ions are shown as grey and red spheres, respectively, while protein residues are shown as sticks. Interactions between the Zn(II) ions and their coordination residues are shown as green dashed lines.
