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Bilateral microinjections of morphine hydrochloride (5.0; 7.5; 10.0 micrograms/0.5 microliters/side) or saline were infused into 3 different regions (dorsal, medial, ventral) of the rat globus pallidus, to examine their effects on locomotor activity. Locomotor activity of each rat was measured 45 min before and 90 min after saline or morphine pallidal(More)
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