Survival fraction (SF), obtained by clonogenic assay, at day 2 (a) and at day 6 (b). The results represent the mean of three independent experiments ± standard error of the mean (SEM). At both time points and for all groups, survival is significantly reduced compared to its own controls. The only exception is observed for Group III at day 2, at 10 mGy, being the survival fraction similar to unirradiated control (p=0.84). In the media transfer experiment, group II a lower survival fraction is observed at 10 mGy, which corroborates with the HRS observed, by means of MN assay, at this dose value. Note: The lines are purely eye guided.