The chemical reactions and pathways resulting in the formation of norepinephrine, a hormone secreted by the adrenal medulla, and a neurotransmitter in the sympathetic peripheral nervous system and in some tracts in the central nervous system. It is also the demethylated biosynthetic precursor of epinephrine. [GOC:jl, ISBN:0198506732]
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M5: Ontology GO: Gene Ontology GO:BP: GO Biological Process
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