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Tail suspension test. Immobility scores were measured on days 8, 15, and 29 post-surgery. No difference in immobility between PSNL and sham-operated animals was observed at any time point. There was significantly (P<0.05) less immobility on day 29 than at earlier time points post-surgery. Statistical analysis was performed using the two-way anova followed by post-hoc tests where appropriate. *P<0.05 compared with PSNL day 15; + P<0.05 compared with sham day 15.
