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Instrumental analyses of the interaction between DNA and free PEI. a Isothermal titration calorimetry (ITC) measurement during complex formation; b dissociations of PEI from immobilized DNA; effects of pH (10 mM HEPES, 150 mM NaCl) (c) and NaCl concentration (10 mM HEPES, pH 7.0) (d) on the interaction between immobilized DNA and free PEI, and dissociations of PEI from immobilized DNA
