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The activation of caspase-3 protein in SH-SY5Y cells exposed to 150 μM 6-OHDA and 6-OHDA plus protective doses of morphine for 24 h. Each value represents the mean±SEM band density ratio for each group. β-actin was used as an internal control. ***P<0.001 significantly different versus control cells. +++P<0.001 versus 6-OHDA treated cells.
