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a) Confocal microscopy images of Caco-2 cells after 4 h incubation with Ce6-labeled insulin (Ce6-insulin) loaded IPUL, IPUL-CS, and IPUL-CST (10 μg/mL of Ce6-insulin concentration). b) Cellular uptake efficacy of Ce6-insulin loaded IPUL, IPUL-CS, and IPUL-CST using flow cytometry.
