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H&E staining and TUNEL assay in reconstituted human 3D skin model. (a) H&E staining showing morphological changes after the skin culture was treated with control, UV alone or F18 combined with UV. Magnification: 20×. (b) TUNEL assay demonstrated UV induced apoptosis can be attenuated by F18 treatment. Enlarged images emphasize apoptotic positive cells (magnification 10×). Scale bars, 10 μm.
