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Abstract In the brain, tryptophan byproducts are involved in the biosynthesis of proteins, energy-rich molecules (e.g., NAD+), and neurotransmitters (serotonin and melatonin). Impaired tryptophan catabolism, seen in aging, neurodegeneration and psychiatric diseases, affects mood, learning, and sleep; however, the reasons for those impairments in the elderly and in those suffering from these ailments remain unknown.
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