as urinary levels of norepinephrine and normetanephrine are derived from an extraneuronal metabolic pathway , while levels of 3-methoxy-4-hydroxyphenylglycol and vanillylmandelic acid are more representative of total norepinephrine metabolism , these results suggest that there is a shift in endogenous depression to extraneuronal metabolic pathways for norepinephrine and its metabolites .
C0028385
normetanephrine
C0028351
norepinephrine