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The bound ions and their immediate vicinity. (A) A chloride ion bound to residues Arg-80, Arg-87, and Tyr-50. The minimal distances between the ion and the residues were 2.24, 2.86, and 2.02 Å for Arg-80, Arg-87, and Tyr-50, respectively. (B) A sodium ion bound to Glu-31. The minimal distance between the ion and the protein is 4.34 Å.
