Schematic representation of experimental design. Numerals within the time course arrow denote the number of days after the start of chronic treatment with L-DOPA, GEB (200, 400, and 800 mg/kg), AMTD (40 mg/kg), or vehicle. Contralateral turning behavior was tested 14 days later, after apomorphine injection. Three weeks after the introduction of 6-OHDA lesions, mice were administered with L-DOPA, GEB, or AMTD daily for 10 days. AIMs scores were assessed on days 2, 5, and 9 after initial treatment.