Figure 2: Effect of EEEV and RA on cell viability before 6-OHDA exposure. EEEV or RA (0.0025 – 1 μg/mL) was added to SHSY5Y cell culture 1 h before 6-OHDA (25 μg/mL). After 24 h, cell viability was evaluated by the MTT assay. A versus control, B versus 6-OHDA (P < 0.05, ANOVA and Tukey as the post-hoc test). 6-OHDA, 6-hydroxydopamine; EEEV, ethanolic extract of E. velutina ; RA, rizonic acid.