Definition: The word "AAG" is a rare and unusual form of amino acid that does not normally appear in human diets. It consists of three amino acids - alanine, aspartic acid, and glutamine. 1. Alanine: Alanine is a non-essential amino acid found in the small intestine. It plays an important role in protein metabolism by synthesizing essential amino acids from proline, lysine, and glutamine. 2. Aspartic Acid: Aspartic acid is a non-essential amino acid that can also be synthesized in the body but does not have a primary function. 3. Glutamine: Glutamine is a non-essential amino acid that plays a vital role in protein synthesis by synthesizing proline, lysine, and arginine. In summary, AAG is a unique form of amino acid found in humans with a special structure and no normal counterpart. It is not commonly seen in human diets, but it can be found in some foods and supplements, particularly those high in glutamine.