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Successfully established tumor xenograft model (A). The passive targeted in vivo tumor accumulation of fluorescein isothiocyanate delivered by polyethylenimine (PEI)- and vesicle-based polyplexes (B and C, respectively) under the same conditions.
Note: All the images were observed by the IVIS® Lumina II Imaging System (Caliper Life Sciences, Hopkinton, MA).
Abbreviation: ROI, region of interest.
