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Photomicrographs of nuclei observed under an epifluorescence microscope after the alkaline comet assay. (a) Non-damaged DNA of HepG2 cells; (b) HepG2 cells treated with 400 μg/mL of strawberry tree aqueous leaf extract (STE) in vitro for 24 h; (c) highly fragmented nucleus of HepG2 cell in the positive control (hydrogen peroxide, 100 µM) applied for 10 min. Stained with ethidium bromide. Magnification ×200; scale bar, 20 μm.
