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The rate of PCNA-positive immunity reaction cells in intestine of mice. Both stress and CH decreased the PCNA-positive cell rate, which was lowest in the stress + CH group, among the four groups. The different letters in the 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.
