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(a) Transfection efficiency and (b) cell viability for DNA/PATK (N/P = 100), DNA/non-degradable poly(amine) (N/P = 120), and DNA/B-PEI polyplexes (N/P = 9) in PC3 cells. The N/P ratios of the polyplexes were determined by optimized transfection efficiency and cytotoxicity. * indicates p < 0.05. ** indicates p < 0.01.
