All surgical procedures were performed under general anesthesia with ketamine/xylazine. 2μl 6-OHDA (20 mg/ml in 0.02% ascorbic acid) was stereotaxically injected into the right striatum of male SD rats. Lesion coordinates were set according to bregma and dura in mm: ML-3.7; AP-1.0; DV-5.5. The injection rate was 2μl/5 min and the injecting needle was left for 2 minutes after injection to avoid back flow. Apomorphine-induced rotations (see below) were assessed three days post-lesion and rats with ≥ 30 full contralateral rotation/30 minutes were included in the study.
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