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Effect of He-Ne laser irradiation on extracellular signal-regulated kinases (ERK) phosphorylation in cultured human epidermal stem cells (ESCs). Western blotting showing ERK phosphorylation in cultured human ESCs with or without a single exposure to 2 J/cm2 of 632.8 nm He-Ne laser. Results shown are representative data of three separate experiments. Values are fold changes of basal phospho-ERK levels and are expressed as mean±SEM of three independent experiments.
