The one letter abbreviation for each of the twenty amino acids is listed below:

Alanine	A	Glutamine	Q	Leucine	L	Serine	S
Arginine	R	Glutamic Acid	E	Lysine	K	Threonine	T
Asparagine	N	Glycine	G	Methionine	M	Tryptophan	W
Aspartic Acid	D	Histindine	H	Phenylalanine	F	Tryosine	Y
Cysteine	C	Isoleucine	I	Proline	P	Valine	V