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Confocal images of intracellular uptake of siRNA (red) mediated by (A) G2D, (B) LF, or (C) PEI in comparison to (D) cells treated with Lysotracker but without nanoparticles. Endosomal entrapment is shown by colocalization with Lysotracker (yellow). Empty endolysosomes are shown in green.
