phenylalanine
phenylalanine An essential amino acid; in addition to its role in protein synthesis, it is the metabolic precursor of tyrosine (and hence noradrenaline, adrenaline, and the thyroid hormones). Dietary tyrosine spares phenylalanine, so reducing the requirement.
phenylalanine
phen·yl·al·a·nine / ˌfenəlˈaləˌnēn; ˌfēnəl-/ • n. Biochem. an amino acid, C6H5CH2CH(NH2)COOH, widely distributed in plant proteins. It is an essential nutrient in the diet of vertebrates.
phenylalanine
phenylalanine
phenylalanine (fee-nyl-al-ă-neen) n. an essential amino acid that is readily converted to tyrosine. Blockade of this metabolic pathway gives rise to phenylketonuria.
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phenylalanine