Rats weighing 240–300 g were anesthetized with intraperitoneally (i.p.) administered pentobarbital sodium (60 mg/kg). The 6-OHDA (4 μg 6-OHDA dissolved in 4 μL sterile saline containing 0.02% ascorbic acid) was unilaterally injected into the right hemisphere (coordinates from bregma: AP, -4 mm; ML, +1.65 mm; DV, -8 mm) according to the Paxinos and Watson's rat brain atlas (1998) with a Hamilton syringe (0.46 mm in diameter, blunt tip) at a rate of 0.5 μL per minute. The needle was kept in place for 8 min and then slowly withdrawn over a 3 to 4 min period.
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