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Confocal laser scanning microscopy 3D cross-section images of Caco-2 and HT-29 cells treated with FITC-TP5-PEG-niosomes (green) at 0.5, 1, 2, 3, 4, and 5 h in contrast to cell nuclei (blue), cytoplasm (red), and merged (green, blue, and red) (magnification = 500×).
