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Luciferase expression generated by delivery of pDNA using Dex-PEI conjugates and PEI controls prepared at various N/P ratios in HEK293 cells. Complexes were incubated with HEK293 cells for 4h in serum free media. The media containing complexes was then removed and cells were cultured in serum containing media for a further 44h before measurement of luciferase acitivity. Mean+SD, n=4 (ND: naked pDNA)
