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A, a Cl− ion near the Nη atom of Arg264 of one monomer of the dimer, in which the backbone of the dimeric coiled-coil structure is depicted as a ribbon with all side chains. B, 2|Fo| − |Fc| electron density map of the Cl− binding site with a contour level of 1.5σ, in which the Cl− ion only binds with the Nη atom of Arg264 at a distance of 3.15 Å via a hydrogen interaction.
