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The problem of the interaction of DNA with cationic order to clarify possible structure–function correlations [12– 16]. Although significant efforts have been carried out in the study of these structures, the physical processes occurring gely unclear. A variety of biomedical applications employs cationic lipid–DNA complexes (lipoplexes) as preferential DNA delivery vehicles in gene therapy [1–3]. It is well known that the complexation of negatively charged DNA wit