Two types of primary dopamine receptors are recognized specifically D (stimulatory) and D (inhibitory). Both those receptors require G-protein for his or her pastime. D receptors are placed at the dopaminergic neurons and convey poor remarks. They are also called auto-receptors as they could inhibit the discharge and synthesis of dopamine. The binding of dopamine to the D receptors stimulates the hobby of Adenylyl cyclase (AC) which converts ATP into cyclic AMP (d messenger).