Serotonin N-acetyl transferase. Molecular model of serotonin N-acetyl transferase complexed with coenzyme A-S-acetyltryptamine. Serotonin N-acetyl transferase is the penultimate enzyme involved in the conversion of serotonin to melatonin in the cells of the pineal gland in the brain. Melatonin modulates the function of the circadian clock, influencing activity and sleep.
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