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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY


Caption: Tryptophan is an important amino acid and the metabolic precursor to serotonin.

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Keywords: amino acid, diagram, essential amino acid, hydrophobic, illustration, l-tryptophan, l-tryptophan hydrochloride, model, molecular, molecular model, molecular structure, molecule, niacin, serotonin, tryptophan

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