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Impact of IQ exposure on cell proliferation (immunostaining for Ki-67). Values represent the number of Ki-67 positive nuclei per 300 tumor cells for polypoid or flat lesions and 6–7 normal colonic crypts for nonneoplastic mucosa (mean ± SEM. Asterisk: Significantly different from the DSS control group (P < 0.05) as determined by the Wilcoxon 2-sample test.
