The neurotransmitters dopamine - epinephrine - and norepinephrine - which are active in both the brain and the peripheral sympathetic nervous system. These three molecules have certain structural similarities and are part of a larger class of neurotr

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1. The neurotransmitters dopamine - epinephrine - and norepinephrine - which are active in both the brain and the peripheral sympathetic nervous system. These three molecules have certain structural similarities and are part of a larger class of neurotr