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Change in Tm2→1 (at rdd = 5.0, 6.0, and 7.0) for denaturation of d[5’-A30T30-3’] in the presence of 3. Buffer conditions: 100 mM KCl, 10 mM SC, 0.5 mM EDTA, pH 6.8. The melting rate was 0.2 °C/min. [DNA] = 1 μM/ duplex.