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The effects of intraperitoneal (i.p.) or intrathecal (i.t.) injection of antagonists of acetylcholine, noradrenaline, serotonin, dopamine, opioids and GABA on stimulation-produced antinociception (SPA) from the pedunculopontine tegmental nucleus (PPTg) of rats were studied using the tail-flick test. The electrical stimulation of the PPTg produced a strong and long-lasting increase in tail-flick latency...
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