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Transfection efficiencies of TAT peptide derivative/DNA complexes in A549 cells. (A) TAT/DNA and TAT-PEG/DNA complexes at an N/P ratio of 30 with different concentrations of calcium chloride (B) TAT/DNA complexes at different N/P ratios (C) TAT-PEG/DNA complexes at different N/P ratios. L= Lipofectamine.
