A) Jurkat and B) ML-1 cells were pretreated with NAC and GEE and then exposed to DOX and DNR for 24 hours. Viability was assessed. C) H9C2 cells were pretreated with NAC and subsequently exposed to DOX and DNR for 24 hours and DNA fragmentation was assessed. The results represent the mean ± SEM of 3 different experiments D, E) Jurkat and F, G) ML-1 cells were pretreated with N-acetylcysteine (NAC), and then exposed to DOX and DNR. GSH levels were measured by quantification of fluorescence by spectrofluorometry. The results represent the mean ± SEM of 3 different experiments, *p<0.05, **p<0.01.