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Comparison of the longevity of radiation-induced p21WAF-1/CIP1 expression in the small and large bowel. Shown are large bowel (a and c) and small bowel (b and d) at either 96 hours (a and b) or 6 days (c and d) after irradiation. Data are the mean results from a minimum of four mice at each time point. At least 1000 cells (50 half-crypts) were scored from each mouse. The data are from one experiment typical of two.
