the effect of muscimol ( 2 mg/kg i.p . ) on reduction of immobility time was prevented by intraperitoneal alpha-methyl-para-tyrosine ( 250 mg/kg i.p . ) , which reduces brain catecholamine content , haloperidol ( 0.5 mg/kg ) and sulpiride ( 100 and 50 mg/kg ) , antidopaminergic drugs , and meta-chlorphenyl-piperazine ( 0.6 and 1.25 mg/kg ) , a serotonergic agonist , but not by clonidine ( 0.1 mg/kg ) , an alpha2-adrenoceptor agonist , d , 1-propranolol ( 5 mg/kg ) , an antagonist of beta-adrenergic receptors , or subcutaneous prazosin ( 3 mg/kg ) , an alpha1-adrenolytic drug .
C0006104
brain
C0423896
content