Density of TUNEL+ cells in the testes of males from two treatments (IC and NIC) with (IR) and without (NIR) irradiation. Values displayed represent mean ± SE. We found no significant differences between treatments (irradiation: χ21 = 12.42, P = 0.0004; treatment: χ22 = 6.18, P = 0.046; tissue: χ22 = 75.08, P < 0.0001; treatment*irradiation: χ22= 8.55, P = 0.013; treatment*tissue: χ24 = 23.75, P < 0.0001; irradiation*tissue: χ22 = 46.56, P < 0.0001; irradiation*treatment*tissue: χ24 = 49.10, P < 0.0001).