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Viability assessment on human dopaminergic neuronal-like cells treated with 6-OHDA toxin. Cells were treated with 0.15 μM 1a, 3, or CSC for 3 h prior to addition of 20 μM 6-OHDA. After 24 h, resazurin was added for another 2 h, whereupon cell viability was assayed. Data are shown as the mean ± SEM and were analyzed using one-way ANOVA with Newman–Keuls multiple comparison test: (###) p < 0.001 versus control and (∗∗∗) p < 0.001 versus 6-OHDA alone.
