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Thermal denaturation study of the complexes of β-carbolines (4B, 6i, 4D, and 6u) and CT-DNA. Melting temperatures were measured in PBS-EDTA buffer (1 mM Na2HPO4, 0.1 mM EDTA, PH 7.4) with a β-carboline (4B, 6i, 4D, and 6u)/DNA ratio of 0.5. ΔTm = (ΔTm4B,6i,4D, or 6u + DNA − ΔTmDNA).
