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Complete hydrogen bond networks in the major proton channel. The 2Fo–Fc neutron map (courted at 1.0 σ) is shown by meshes. Coordination and hydrogen bonds are shown by dotted black and red lines, respectively. D and H atoms are colored by cyan and white, respectively. Na, Cl, and Cu4 atoms are eliminated for the clarity. Only the major conformation of Wat3 is shown here for the clarity.
