Flow cytometry plots of splenocytes apoptosis. The splenocytes were isolated from mice treated with atrazine (2-chloro-4-ethytlamino-6-isopropylamine-1,3,5-triazine; ATR) for 21 days. The annexin-V and propidium iodide (PI) fluorescence was measured using flow cytometer. Results were expressed as dot plots. (a) Control group; (b) 100 mg/kg ATR; (c) 200 mg/kg ATR; (d) 400 mg/kg ATR.