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Effects of pH on the type 2 sites in NeNIR and RsNIR. A, NeNIR at pH 6.5 (purple) and pH 8.5 (pink). B, RsNIR at pH 6.0 (light blue, PDB code 2DY2) and pH 8.4 (dark blue, PDB code 1ZV2). Copper ions are shown as large spheres, and water molecules are shown as small spheres.
