Assessment of cell viability after pretreatment with isoquercitrin. The isoquercitrin pre - treatment showed a significant increase in cell viability compared to cells treated with 6-OHDA alone. The cell viability was the highest at 10 μM of isoquercitrin at all the three durations of time. Cell viability increased as the cells exposed for 12 hrs. with isoquercitrin. Values are the percentages of viable cells, with the viability of untreated control cells (control) taken as 100%. Data are mean and S.E. values from three independent experiments (n = 3). #p < 0.05, relative to control cells. *p < 0.05, **p < 0.01 and ***p < 0.001, relative to cells treated only with 6-OHDA.