Catecholamine neurotransmitters are a class of neurotransmitters (chemical messengers between brain, spinal cord and nerve cells) that are derived from levodopa (L-DOPA) metabolism in the body. L-DOPA is synthesized in the body from L-tyrosine, the amino acid. They include: adrenaline (epinephrine), noradrenaline (norepinephrine) and dopamine. See the figure below for the biosynthesis pathway of the catecholamines (in order from dietary component [L-tyrosine] to the final metabolism product in this pathway). 

Catecholamines and their prescursors

Catecholamines and their precursors

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