Fig. 3. (A) Effects of 5 μM of butein, isoliquiritigenin, scopoletin, or 1 μM resveratrol on H₂O₂-induced cell viability (***p < 0.001 vs. control; ^###p < 0.001 vs. 400 μM H₂O₂-treated group). (B) Morphology of SH-SY5Y cells in the presence of 400 μM H₂O₂ and the cells pretreated with 5 μM of butein, isoliquiritigenin, scopoletin, or 1 μM resveratrol following exposure to 400 μM H₂O₂. Observations were made under light microscopy at 20× magnification.