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Alterations in plasma levels of cholecystokinin (CCK) in non-irradiated animals (Sham) and irradiated animals at 1, 2, 4, or 8 days after radiation injury. Data are presented as means ± SE (n=6) and compared by one-way ANOVA and student-Newman-Keuls method: * P<0.05 versus Sham group.
