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The effect of morphine (6mg/kg) and naloxone (1mg/kg) on latency times to pain stimulus: each line show the mean ± SEM for every drugs in four times (every 30 min from 0 up to 90). Control group received saline/saline, other groups received morphine or naloxone / saline. *P < 0.05 show significant difference between morphine 6mg/kg and control group at the same time.
