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Intense electrical stimulation of meridian points in the rat inhibits the nociceptive tail withdrawal reflex. The objective of the present study was to determine whether spinal opioid receptors mediate this inhibition. Electrical stimulation was applied with 2 ms square pulses, at 4 Hz for 20 min at 20 times the threshold, to previously defined meridian points in the hindlimb. Threshold was the minimum...
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