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The effect of curcumin on spinal levels of inflammatory cytokines in morphine-dependent rats. The concentration of TNF-α and IL-6 were measured in the lumbar part of the spinal cord by using the ELISA method at the end of the trial (19th day). Data are expressed as mean ± S.E.M for four rats. *P < 0.05, ***P < 0.001 (compared to control); ###P < 0.001; Control: normal saline + DMSO
