An aromatic amino acid that is essential in the animal diet. It is a precursor of melanin, dopamine, noradrenalin, and thyroxine.
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).
An essential amino acid. L-Phenylalanine is one of the raw materials used to manufacture NutraSweet® (NutraSweet Co.) synthetic sweetener.
One of the essential amino acids present in milk.
An essential amino acid containing a phenyl group and alanine; a precursor to tyrosine.
Phenylalanine is an essential amino acid involved in protein structure as well as many nonprotein functions. Phenylalanine is used to produce tyrosine, which can subsequently be metabolized to a variety of neurotransimitters and hormones including L-DOPA, dopamine, norepinephrine, epinephrine, melanin, and thyroid hormone. Potential ergogenic roles of phenylalanine have not been identified.
Amino acid essential for growth in children and for protein metabolism in children and adults; it is abundant in milk and eggs.
An amino acid that accumulates in excessive amounts in phenylketonuria, an inherited enzyme deficiency disease that causes mental retardation if not diagnosed and treated soon after birth.
An essential amino acid that is readily converted to tyrosine. Blockade of this metabolic pathway gives rise to phenylketonuria, which is associated with the excretion of large amounts of phenylalanine and phenylpyruvic acid in the urine and retarded mental development.
A natural amino acid essential for growth in infants, and for nitrogen metabolism in adults.
An essential amino acid, one of the two linked amino acids in the sugar substitute aspartame. The genetically determined inability to dispose of excess phenylalanine is known as phenylketonuria (PKU).
An indispensable amino acid necessitating dietary intake as the human body lacks the ability to synthesize it internally.