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Effect of morphine (morph) and carprofen (carp) on the percentage time spent in the light compartment during the mPEAP trial in sham and surgery rats. Data are mean + SEM (n = 7–9). *P < 0.05 sham saline versus surgery saline; ## P < 0.01 surgery morph versus surgery saline; + P < 0.05, ++ P < 0.01 surgery carprofen versus surgery saline.
