Fig. 4

Cytotoxicity of the feces extracts from rats exposed to chlorpyrifos (CPF). Cell viability was determined using the MTT assay after the HT-29 cells were treated by the feces extracts from the rats exposed to medium dose of CPF (3.26 mg/kg/day) for different time (A) or treated for 48 h with the feces extracts from rats exposed to CPF at doses of 1.30 mg/kg/day (L), 3.26 mg/kg/day (M), and 8.15 mg/kg/day (H), respectively (B). ^*P < 0.05 and ^**P < 0.01, compared with the control