D Ultragenik keto receptors are placed on the dopaminergic neurons and bring bad feedback. They also are known as vehicle-receptors as they are able to inhibit the release and synthesis of dopamine. The binding of dopamine to the D receptors stimulates the interest of Adenylyl cyclase (AC) which converts ATP into cyclic AMP (nd messenger). The cyclic AMP (cAMP) then binds with the protein kinase A (PKA).