Fig. 2

The cell viability of PC12 cells with HEPS. a, (b) PC12 cells were treated with different concentrations (0, 25, 50, 100, 200 and 250 μg/mL) of HEPS and incubated for 24 and 48 h. Cell viability measurements were used to evaluate cell death using the MTT assay. Serum-free RPMI-1640 medium is indicated as N⁻. All values are mean ± SD and used a one-way analysis of variance (ANOVA, n = 6). All columns were significantly different (p < 0.05)