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Overall crystal structure of a DNA containing Ç. (a) Stick figure representation of an A-form duplex DNA crystal structure containing Ç solved at 1.7 Å resolution. For clarity, Ç is shown in light blue carbon backbone and the remainder of the DNA is shown in gray carbon backbone. (b) Final crystallographic model containing waters overlaid with the 2|Fo|−|Fc| electron density map shown in blue mesh and contoured at 1.0 σ.
