Figure 5. Cell survival curves for colonies in pig epidermis containing different numbers of bromodeoxyuridine (BrdU)-positive cells. The four categories of colony size are indicated by the number of BrdU-positive cells per colony. Skin biopsies were taken at (a) 14/15 days, (b) 17/18 days, (c) 21/22 days and (d) 25/26 days after irradiation. Data for 27 Gy at 25/26 days after irradiation (d) were not included in the analysis. Data obtained by Chen et al [1], using a comparable clonogenic assay, are indicated in (c) for comparison (
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