Apoptosis ratio in a) neutrophils, and b) lymphocytes in chronic renal failure (CRF). Control (C), Saline (SF) treated, Captopril (CAP) treated, Valsartan (VAL) treated, N-acetyl-L-cysteine (NAC) treated, CAP+NAC treated, VAL+NAC treated CRF groups. Apoptosis ratios were calculated by dividing the values of after-stimulation to the values obtained prior to phorbol myristate acetate stimulation. * p<0.05, ** p<0.01 and *** p <0.001 compared with control, + p<0.05, ++ p<0.01, +++ p<0.001 compared with SF treated CRF group.