Amino Acids Not Found in Proteins

S-Adenosylhomocysteine  Citrulline  L-Homoserine
S-Adenosylmethionine -Cyanoalanine  L-Ornithine
 -Alanine  D-Glutamic Acid  Sarcosine
 D-Alanine   Amino butyric acid (GABA) L-Thyroxine
Azaserine  Homocysteine