During the synthesis of the neurochemical _________, a precursor is released from synaptic vesicles back into the intracellular fluid for conversion by the enzyme phenylethanolamine N-methyl-transferase (PNMT).

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The neurochemical being described is epinephrine. The synthesis of epinephrine involves the conversion of its precursor, norepinephrine, by the enzyme phenylethanolamine N-methyl-transferase (PNMT). This process typically occurs within the adrenal medulla and certain neurons in the brain.

During the Synthesis of the Neurochemical _________, a Precursor Is