Medically reviewed by Aviv Joshua, MS, RDN Phenylalanine is an essential amino acid (building block of protein) that the body ...
Chemically, an amino acid is a molecule that has a carboxylic acid group and an amine group that are each attached to a carbon atom called the α carbon. Each of the 20 amino acids has a specific ...
Credit: COURTESY OF THE SMITHSONIAN INSTITUTION Frederick Sanger presented the first complete amino acid sequence of a protein (insulin) after 12 years of painstaking biochemistry involving partial ...