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Figure 9. Au3+ binding to the accessible G7-C17 base pair of the subtype-B DIS duplex. (a) Stereoview showing the accessibility of the G7b-C17a pair bound to a gold cation. The composite simulated annealing omit map contoured at 1.3 
is shown in blue and the anomalous difference map contoured at 13.0 above mean level in orange. (b and c) Schematic drawing showing interactions occurring between the cytosine, the gold(III) and the deprotonated guanine.
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