Figure 2: Cytotoxcity of baicalin, wogonoside, baicalein, and wogonin in normal PC12 cells (MTT assay). After 24 h of cells incubation in 96-well plates, the chemicals were added with the dosage from 10 mg/mL to 0.001 mg/mL. * 𝑃 < 0 . 0 5 versus normal control. Data were presented as mean ± S.D. from seven independent experiments.