FIGURE 5.  Effect of ¹³¹I irradiation on subsequent ³H-thymidine incorporation. Results are given as ³H-thymidine incorporation in irradiated cultures relative to that in nonirradiated cultures. Hypersensitivity was obtained at 0.01 and 0.1 Gy (see inset). * = data that were statistically significantly different from control data (P < 0.05). Data are given as mean ± SEM (n = 3–21).