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Luciferase expression determined of pLuc/PEI25K and pLuc/PMet-P(cdmPEG2K) micelleplexes at different N/P ratios. The treated cells were incubated in FBS-free culture medium at pH 7.4 and pH 6.8 for 4 h and further incubated in culture medium at pH 7.4 containing 10% FBS for 48 h.
