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Transfection efficiency of PLG nanoparticles in A549 cells varied with different coating materials. Most PLG nanoparticles exhibited long-term expression that tended to increase over time. PEI complexes N/P 10 showed higher gene expression that dropped to negligible levels by day 5. Expression of day 14 was significantly higher than day 7 in A549 cells. Data are presented as mean ± SD (n = 3), *p < 0.001 when compared to day 5 for the same sample.
