Medically reviewed by Aviv Joshua, MS, RDN Phenylalanine is an essential amino acid (building block of protein) that the body ...

Medically reviewed by Allison Herries, RDN L-tyrosine is an amino acid that's often used in supplements to improve cognitive ...

Disruptions in amino acid and lipid metabolism may be biomarkers of tardive dyskinesia (TD), according to a study published ...

The present work was carried out, using phenylalanine labelled with carbon-14, to examine whether phenylalanine is a precursor of tyrosine.

During that same year, Marshall Nirenberg and Heinrich Matthaei began deciphering the genetic code, and they determined that the codon UUU specifically represented the amino acid phenylalanine.