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The intrastriatal injection of [Nle10]-NKA(4-10), a neurokinin A agonist, (0.05-5 ng/mouse) elicited vigorous contralateral rotations. This behavior was dose-dependently antagonized by SR 48968 (ED50: 0.15 mg/kg i.p.: 0.19 mg/kg p.o.), a selective non-peptide antagonist of NK-2 receptors, but it was not affected by spiroperidol. This suggests that NK-2 receptor stimulation may affect the activity of the striatum without necessarily involving dopaminergic systems.
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