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Number of caspase-3 positive immunity reaction cells in intestine of treatment mice. In stress mice and the CH group, an increase of caspase-3 positive cells appeared, and stress + CH treatment caused the most caspase-3 positive expression in mice. Different letters in the same column indicate a significant difference among groups within the same intestine segments (P<0.05). SR, stress-restraint; CH, citalopram; SR+CH, stress-restraint + citalopram.
