3+] can suppress vascular NO production in endothelial cells. Abnormal vessels can cause obstruction by either encircling the trachea and esophagus (complete vascular ring) or compressing the anterior wall of the trachea alone.
Î±-Amino acid (alpha-amino acid): A molecule containing an amino group and a carboxylic acid group that are separated by one carbon, called the Î±-carbon. In biochemistry there are twenty standard amino acids which differ in the makeup of the side chain (R group) attached to the Î±-carbon.-Amino acid (alpha-amino acid): A molecule containing an amino group and a carboxylic acid group that are separated by one carbon, called the Î±-carbon. In biochemistry there are twenty standard amino acids which differ in the makeup of the side chain (R group) attached to the Î±-carbon.
They are known as 2-, alpha-, or Î±-amino acids (generic formula H 2 NCHRCOOH in most cases, where R is an organic substituent known as a  side-chain ); often the term amino acid is used to refer specifically to these.n amino acids that have a carbon chain attached to the Î±âcarbon (such as lysine, shown to the right) the carbons are labeled in order as Î±, Î², Î³, Î´, and so on. In some amino acids, the amine group is attached to the Î² or Î³-carbon, and these are therefore referred to as beta or gamma amino acids.