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phenylalanine Syllabification: phen·yl·al·a·nine
Pronunciation: /fen(ə)lˈalənēn/

Definition of phenylalanine in English:


An amino acid widely distributed in plant proteins. It is an essential nutrient in the diet of vertebrates.
  • Chemical formula: C6H5CH2CH(NH2)COOH
Example sentences
  • Trypsin favors basic residues like lysine and arginine; chymotrypsin favors aromatic residues like phenylalanine, tyrosine, and tryptophan.
  • Like its amino-acid sister phenylalanine, tyrosine is a key nutrient that your body can use to restock NE stores depleted by ephedrine.
  • The amino acids tyrosine and phenylalanine are the building materials for catecholamines, which are used as source material for both neurotransmitters and for hormones.
Definition of phenylalanine in:
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