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UVB stimulates intracellular hydrogen peroxide production. Undifferentiated and differentiated keratinocytes were incubated with 2′, 7′-dicholorofluorescein-diacetate (5 μM) for 15 min. The cells were then exposed to UVB (25 mJ/cm2) or control and analyzed by flow cytometry. Data are presented on a four-decade log scale.
