Table 1.

Activities of drugs used in this study

Drug	Vertebrate activity	Activity in decapitated flies
SCH 23390, SKF 85366	D1-like antagonist	Akinesia, extended posture, tremor
SKF 82958, SKF 81297	D1-like agonist	Hindleg grooming
Eticlopride, raclopride	D2-like antagonist	Akinesia, contracted posture
Quinpirole	D2-like agonist	Locomotion, hindleg grooming, hyperactivity
Hydrazaline	Monoamine–oxidase inhibitor	Potentiates amine responses