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Drawing of the three-dimensional structure of VIM-4 (PDB identifier 2WHG) showing the position of amino acid 57. The side chain of Ala57 lies at the vicinity of the side chain of Asn91. The B2 β-strand and the H1 α-helix, which contain the active site residues Phe61 and Trp87, respectively, are also shown. Side chains of the above amino acids and of other active site residues are indicated as sticks. Spheres represent the two Zn2+ ions.
