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Oxyanion hole of a) OXA-10, b) OXA-23, and c) OXA-48. In the above panels, residues surrounding and stabilizing the oxyanion holes are represented with spheres. In the below panels, the zoomed views of the oxyanion holes with stick representation of the stabilizing residues which form the crevice are given. The water molecules are shown in red and the stabilizing residues are shown in yellow-orange spheres.
