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Systemic morphine injected on post-operative day 13 partially reversed tactile allodynia after TRR. *P<0.05 compared with the pre-operative level (repeated measures ANOVA). † P<0.05 compared to the threshold at POD 13 (repeated measure ANOVA), just before morphine injection, shows that relief is only significant for the 0.5 h after morphine. Data are expressed as means ± S.E of 7 rats.
