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Cellular uptake and transfection efficacy of the nanoparticles. (A) Uptake efficiency of nanoparticles. (B–D) Transfection results of nanoparticles in HeLa cells (B), HEK-293T cells (C) and A549 cells (D). A group of cells treated with bare pDNA solution containing 1 μg per well of 24-well plate were used as control; ** indicates p < 0.01.
