Amino acidis 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), their symbols and abbrevations.

Amino acidAbbreviationSymbol
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

ArginineTryptophanLeucinelysineAmino acid symbols Essential amino acidsNon-Essential amino acids

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