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Representative examples of metal binding sites in sproteins. (A) Zinc-binding site in 9630046D09, (B) iron-binding site in 2810007 M22, (C) calcium binding site in I920026J24, and (D) magnesium-binding site in I420022F17. Putative positions of binding metals and predicted binding residues are shown as orange balls and sticks colored by atom type, respectively.
