Survivin protein in cytoplasmic and nuclear fractions measured by ELISA as a function of treatment protocol in SA-NH and FSa tumor cells. P values were determined by comparing the protein content in the unirradiated control cytoplasmic (C) and nuclear (N) fractions with their corresponding groups from the three treatment protocols: 2 Gy only (SA-NH, P = 0.416 and 0.686, C and N, respectively and FSa, P = 0.814 and 0.469, C and N, respectively; 5 mGy+ 2 Gy ( SA-NH, P = 0.020 and 0.133, C and N, respectively; FSa, P = 0.597 and 0.009, C and N, respectively; and 5 mGy+NAC +2 Gy (SA-NH, P = 0.773 and 0.700, C and N, respectively; FSa, P = 0.016 and 0.996, C and N, respectively. Comparisons were performed using a Student’s two-tailed t-test with P values 0.05 identi ed as signi cant. Each experiment was repeated three times and error bars represent the SEM.