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Fluorescence microscopy cross section ((a), 10×; (b), 50× magnification) of hamster cheek pouch mucosa to which Nile Red dye was applied in an ethanol:water (50:50) topical delivery vehicle. Histology cross section ((c); 10×, (d): 50× magnification) of hamster cheek pouch mucosa stained with hematoxylin and eosin.
