Amino acid is the smallest unit of protein and is an organic molecule made up of amine and carboxylic acid functional groups. An amino acid is composed of nitrogen, carbon, oxygen, and hydrogen molecules. Amino acid is the smallest unit of protein and is an organic molecule made up of amine and carboxylic acid functional groups. An amino acid is composed of nitrogen, carbon, oxygen, and hydrogen molecules.

Table: List of amino acids (AA) and their symbols and abbrevations.

Amino acid	Abbreviation	Symbol
Phenylalanine	Phe	F
Leucine	Leu	L
Serine	Ser	S
Tyrosine	Tyr	Y
Cysteine	Cys	C
Tryptophan	Trp	W
Leucine	Leu	L
Proline	Pro	P
Histidine	His	H
Glutamine	Gln	Q
Arginine	Arg	R
Isoleucine	Ile	I
Methionine	Met	M
Threonine	Thr	T
Asparagine	Asn	N
Lysine	Lys	K
Serine	Ser	S
Arginine	Arg	R
Valine	Val	V
Alanine	Ala	A
Aspartate	Asp	D
Glutamate	Glu	E
Glycine	Gly	G

Amino Acid Content in Foods

Arginine	Tryptophan
Leucine	lysine
Amino acid symbols
Essential amino acids	Non-Essential amino acids