(biochemistry) An essential amino acid C₉H₁₁NO₂ found in most animal proteins; it is essential for growth; the inability to metabolize it leads to phenylketonuria; it is a constituent of aspartame.

plural of phenylalanine

Dated form of phenylalanine.

Alternative spelling of polyphenylalanine

plural of poly-phenylalanine

(biochemistry) An enzyme that catalyzes the oxidation of phenylalanine to tyrosine.

(pathology) The presence of phenylalanine in the blood

plural of phenylalaninemia