Figure 5: Millingtonia hortensis scavenged intracellular free radical in SK-N-SH cell-treated with H₂O₂. The level of intracellular reactive oxygen species production was determined by reactive oxygen species assay. The values present the mean ± standard error of the mean from 3 independent experiments. **P < 0.01, ***P < 0.001, in comparison with the control treatment;^#P < 0.05,^##P < 0.01,^###P < 0.001, in comparison with the H₂O₂ treatment alone