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Western blot (a) and related densitometric analysis (b) for PARP cleavage and caspase 3 induction by 1o at 0.5, 1 and 5 µM for 4 days in SK-N-BE cells. GSK126 (1 µM) was added as the reference compound. β-Actin was used as loading control. Error bars represent standard deviation.
