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(a) Binding site for the Ber molecules at the 3′-end G-tetrad; (b) H-bond contacts established by the HOH9 water molecule in the 3′-end binding site; (c) top view of the two Ber molecules stacked on to the 3′-end G-tetrad: skeleton and Fo-Fc omit map for each Ber contoured at 1.5σ level.
