* Alanine (Ala or A) is a non-polar, aliphatic amino acid. It is the simplest amino acid, consisting of a central carbon atom bonded to an amino group, a carboxylic acid group, and a methyl group. Alanine is found in all proteins, and it is often used as a starting point for the synthesis of other amino acids.

* Glycine (Gly or G) is a non-polar, aliphatic amino acid. It is the smallest amino acid, consisting of a central carbon atom bonded to an amino group, a carboxylic acid group, and a hydrogen atom. Glycine is found in all proteins, and it is often used as a flexible linker between other amino acids.