phenylalanine


phe·nyl·al·a·nine

noun \ˌfe-nəl-ˈa-lə-ˌnēn, ˌfē-\

Definition of PHENYLALANINE

:  an essential amino acid C9H11NO2 that is converted in the normal body to tyrosine

Origin of PHENYLALANINE

International Scientific Vocabulary
First Known Use: circa 1883

phe·nyl·al·a·nine

noun \ˌfen-əl-ˈal-ə-ˌnēn, ˌfēn-\   (Medical Dictionary)

Medical Definition of PHENYLALANINE

: an essential amino acid C9H11NO2 that is obtained in its levorotatory L-form by the hydrolysis of proteins (as lactalbumin), that is essential in human nutrition, and that is converted in the normal body to tyrosine—abbreviation Phe; see phenylketonuria, phenylpyruvic acid

phenylalanine

noun    (Concise Encyclopedia)

One of the essential amino acids, present in many common proteins, especially hemoglobin. It is used in medicine and nutrition and as one of the two amino acids making up aspartame. Persons with phenylketonuria do not metabolize phenylalanine properly and must adhere to a diet free of it.

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