[Yield of chromosome aberrations induced by x-irradiation in regenerating rat liver cells at different periods of the generation cycle].

The yield of cells with chromosome aberrations was studied using 630 rad X-irradiated liver cells of intact and hepatectomied rats, hepatectomy being performed 2-24 hours before irradiation. The radiosensitivity was variable throughout the cell cycle. The kinetic curve of radiosensitivity changes shows two ranges of radioresistance: in the early period G1 and in the middle period S, as well as the range of a relatively high sensitivity in the middle of period G1. The increase in radiosensitivity is also characteristic of the G0-G1 transition (4 hours after the stimulation).