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Dose–response of MPP+ in SH-SY5Y cells. SH-SY5Y cells were treated with MPP+ (500 µM–2500 µM), and after 24 h cell viability was assessed using MTT assays. Each bar represents mean percentage cell viability, and significance of difference is indicated with * (p < 0.05), ** (p < 0.01), and *** (p < 0.001).
