Figure 3. Dose-response effect of γ irradiation with 137Cs on neuroblast proliferation. Irradiation was performed on the first day of adult life (D0). BrdU was injected either on D5 (solid line) or on D21 (dotted line), and crickets were killed 2 hr after BrdU injection. Error bars indicate SEM. At 5 d, n = 6, 6, 6, 3, 5, 8, and 6, respectively, for increasing doses; at 21 d, n = 6, 2, 3, 6, 6, 4, and 3, respectively, for increasing doses. The arrow indicates that the dose of 40 Gy was chosen for the following experiments.