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(A) DNA sequences in the absence of DB2277 with m/z 1580–1,780 signifying -6 charged species. Molar concentration ratio of [DB2277] to [DNA] expressed as: (B) [0.5 to 1], (C) [1 to 1], (D) [1.5 to 1], (E) [2 to 1], (F) [2.5 to 1], and (G) [3 to 1]. Concentrations of DNA were fixed at 5 μM. Unbound DNA, 1 to 1, and 2 to 1 complexes labelled above respective boxes.
