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Cell viability as determined by MTT assay. The % cell viability of A549 cells treated with PLGA-PEI-EPI NPs, PLGA-PEI-PTX NPs, EPI-PTX only and PLGA-PEI-EPI-PTX NPs, at (A) 24 h time point, (B) 48 h time point. Data are shown as mean ± SD (n = 3).
