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Schematic drawing of the zinc thiolate clusters in MT. There are three bridging and six terminal cysteine ligands in the N-terminal β-domain (Zn3 cluster) and four bridging and six terminal ligands in the C-terminal α-domain (Zn4 cluster). Based on both x-ray diffraction and NMR spectroscopy data (for general reviews, see refs. 9 and 10).
