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Damage of plasmid deoxyribonucleic acid (pDNA)-loaded lipopolysaccharide-amine nanopolymersomes (pNPs) to the mitochondria of mesenchymal stem cells after serum-free transfection for 48 hours, which is evaluated by the changes in mitochondrial membrane potential quantified by flow cytometer. *P<0.05 versus untreated group (N/P=0).
