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Time profiles of the transient absorption monitored at 520 nm assigned to PTZ•+ after the 355-nm laser flash excitation for (GA)n (a) and (GT)n (b) sequences. n corresponds to the n of (GA)n or (GT)n. Sample solution contained 100 μM duplex DNA, 20 mM sodium phosphate buffer (pH 7.0), and 100 mM sodium chloride.
