α fluoromethylhistidine

All chemicals were used as received from the supplier. Diphenhydramine hydrochloride (20 mg kg⁻¹ or 50 mg kg⁻¹ Sigma Aldrich, St. Louis, MO, USA), zolantidine dimaleate (10 mg kg⁻¹; Tocris, Minneapolis, MN, USA), immepip dihydrobromide (5 mg kg⁻¹; Sigma Aldrich, St. Louis, MO, USA), thioperamide maleate (20 mg kg⁻¹; Sigma Aldrich and Tocris), tacrine hydrochloride (2 mg kg⁻¹; Tocris), and α-fluoromethylhistidine (20 mg kg⁻¹; Toronto Research Chemicals, North York, ON, CAN) were all dissolved in sterile saline (0.9% NaCl solution, Mountainside Medical Equipment, NY, USA) at 5 mL kg⁻¹. Reserpine (10 mg kg⁻¹; Sigma Aldrich, St. Louis, MO, USA) was dissolved in 0.1% acetic acid (Sigma Aldrich, St. Louis, MO, USA) in sterile saline at 5 mL kg⁻¹. Tetrabenazine (Sigma Aldrich) was dissolved in 10% DMSO (Sigma Aldrich, St. Louis, MO, USA) in sterile saline with 1 M HCl (10 µL mL⁻¹ injection volume). All solutions were made fresh at the time of injection and all injections were given via intraperitoneal (i.p.) injection. Urethane (Sigma Aldrich, St. Louis, MO, USA) was dissolved in sterile saline as a 25% w/v solution and administered at 7 µL g⁻¹.