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Toxicity evaluation of oregano oil to normal mouse skins. The dorsal skin of mice was topically treated with (A,C,E) or without 10 mg/ml oregano oil (B,D,F) once a day for three consecutive days. On day 4, the skins were photographed (A,B), followed by histological examination (C,D). The skin sections were also TUNEL stained (E,F). DNase I treated skin samples (G) were TUNEL stained in parallel as positive-staining controls.
