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Two-dimensional COSY spectra of the TH6-TCH3 spectral region are shown for free DNA (A); a 1:1 ratio sample of DB293 to oligo2-1 (B); and a 2:1 ratio (C). Signals for the free DNA and for the 2:1 complex in the 1:1 ratio sample are indicated by connecting lines to the top and bottom spectra.
