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3.2. PLGAChi NPs uptake in 3D organotypic cell cultures of normal human mucosa in 3D cell cultures Intracellular uptake of the PLGAChi NPs was visible in the epithelial compartment of the reconstituted human oral mucosa grown in vitro. The images E. NOKs 200 µg/mL PLGAChi NPs 24h. obtained by fluorescence microscopy revealed that PLGAChi NPs were able to penetrate the superficial layers of the reconstituted epithelial mucosa after 24h exposure at a concentration of 200 µg/mL. F. PLGAChi NPs detection ( NOKs 200 µg/mL PLGAChi NPs 24h). Figure 1. Fluorescence images showing uptake of PLGAChi NPs byNOKs. A. POE9i Control. B. POE9i 20 µg/mL PLGAChi NPs12h. C. POE9i 20 µg/mL PLGAChi NPs 24h. D. POE9i 200 µg/mL PLGAChi NPs 12h. Stomatology Edu Journal CHITOSAN MODIFIED POLY(LACTIC-CO-GLYCOLIC) ACID NANOPARTICLES INTERACTION WITH NORMAL, PRECANCEROUS KERATINOCYTES AND DENTAL PULP CELLS 19