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Another study confirmed that L-theanine and caffeine had additive effects on cognition and attention in 20 healthy men (61)

Genotype-phenotype correlations in ornithine transcarbamylase deficiency: a mutation update

If carnitine transporter is defective, extensive renal wastage of carnitine causes a very low plasma carnitine concentration and subsequently carnitine deficiency
doi: 10.1001/archneur.1988.00520320019008, 252

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The Metabolic and Molecular Bases of Inherited Disease
