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Effect of DA on proteasomal activity in SH-SY5Y cells. Proteasomal activity was measured in SH-SY5Y cells incubated without or with DA (400 μM) for 24 h in the presence or absence of NAC (2.5 mM) as detailed in Section 3. Values (expressed as percentage of the control) are the means ± SD of five observations. Statistically significant differences exist (F (2,12) = 356.38, P < 0.001) between the groups as shown by asterisks (∗).
