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Cell association of formulations in BHK cell line expressed as mean fluorescence intensity (MFI). Mean fluorescence intensity of BHK cells after 16 h incubation with DOTAP-based (A,C) and DDA-based (B,D) liposomes, SLNs, NPs and emulsions in either 5% FCS (A,B) or FCS-free media (C,D). Results are represented as mean ± SD of 3 independent experiments.
