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Dopamine

 

 

 

 

 

Dopamine  is a hormone and neurotransmitter  naturally occurring in humans and an assortment of animals, including both vertebrates and invertebrates. In the brain, this catecholamine (a class of molecules that serve as neurotransmitters and hormones) functions as a neurotransmitter, activating the five types of dopamine receptors — D1, D2, D3, D4 and D5, and their variants.