Phenylalanine vs. Tyrosine

Phenylalaninenoun

(amino acid) 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.

Phenylalaninenoun

an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body

Phenylalanine

Phenylalanine (symbol Phe or F) is an essential α-amino acid with the formula C9H11NO2. It can be viewed as a benzyl group substituted for the methyl group of alanine, or a phenyl group in place of a terminal hydrogen of alanine.

Tyrosinenoun

(amino acid) A nonessential amino acid 2-amino-3-(4-hydroxyphenyl)propanoic acid found in most animal proteins, especially casein

Tyrosinenoun

an amino acid found in most proteins; a precursor of several hormones

Tyrosine

L-Tyrosine or tyrosine (symbol Tyr or Y) or 4-hydroxyphenylalanine is one of the 20 standard amino acids that are used by cells to synthesize proteins. It is a non-essential amino acid with a polar side group.