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Journal of Clinical Investigation, 103(1), 1928
DA is synthesized directly from tyrosine by the enzyme tyrosine hydroxylase (TH), or indirectly from the essential amino acid phenylalanine (Franco et al., 2021), which is transformed into tyrosine by phenylalanine hydroxylase (PH) (Klein et al., 2019)
chow: t (29) = 0.1347, P = 0.8970
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Her work on NAD+ precursors such as nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) has opened up new possibilities for improving cognitive function , promoting longevity , and preventing age-related diseases like Alzheimers and Parkinsons
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