Dopamine molecule. Computer artwork of a molecule of the neurotransmitter and neurohormone dopamine (C8.H11.N.O2). The atoms are represented as spheres and are colour-coded: carbon (black), hydrogen (white), oxygen (red) and nitrogen (blue). Dopamine is one of the most important of the neurotransmitters in the central nervous system (CNS). It plays a critical role in the way the brain controls movement, memory and decision making. Underproduction of dopamine results in the movement disorder Parkinson's disease. Excess dopamine may contribute to psychotic illnesses, notably schizophrenia. Dopamine disorders may also cause some forms of depression.

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