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Effects of 150 μM 6-hydroxydopamine (6-OHDA) alone or accompanied with different concentration of morphine (A) and DAMGO (B) on SH-SY5Y cells viability. Data are expressed as mean±SEM; n=5–6 wells for each group; **P<0.01 and ***P<0.001 significantly different versus control cells. +P<0.05 and +++P<0.001 versus 6-OHDA-treated cells.
