Figure 1

Cytotoxic effects of H₂O₂ on PK15 cells. PK15 cells were plated in 96-well plates at a density of 5 × 10³ cells/well and cultured with H₂O₂ at different concentrations for 48 h. Cell viability were determined by MTT assay (A) and LDH activity assay (B). All results are presented as mean ± SEM (n = 5, each). Significance compared with control (*P < 0.05 and **P < 0.01).