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nor·epi·neph·rine

n :  a catecholamine C8H11NO3 that is the chemical means of transmission across synapses in postganglionic neurons of the sympathetic nervous system and in some parts of the central nervous system, is a vasopressor hormone of the adrenal medulla, and is a precursor of epinephrine in its major biosynthetic pathway - called also arterenol , noradrenaline  - see LEVOPHED  .
 
   

 
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