Alanine

Alanine (abbreviated as Ala or A) is an α-amino acid. It has the chemical formula CH3CH(NH2)COOH. 
The -isomer is one of the 20 amino acids encoded by the genetic code. Its codons are GCU, GCC, GCA, and GCG. It is classified as a non-polar amino acid. 
-Alanine accounts for 7.8% of the primary structure in a sample of 1,150 proteins. Leucine is the only amino acid which is more common. 
-Alanine occurs in bacterial cell walls and in some peptide antibiotics.