Amino Acids Table
The twenty amino acids of proteins: names, three-letter and one-letter codes.
| Amino acid | Code | Letter |
|---|---|---|
| Alanine | Ala | A |
| Arginine | Arg | R |
| Asparagine | Asn | N |
| Aspartic acid | Asp | D |
| Valine* | Val | V |
| Histidine* | His | H |
| Glycine | Gly | G |
| Glutamine | Gln | Q |
| Glutamic acid | Glu | E |
| Isoleucine* | Ile | I |
| Leucine* | Leu | L |
| Lysine* | Lys | K |
| Methionine* | Met | M |
| Proline | Pro | P |
| Serine | Ser | S |
| Tyrosine | Tyr | Y |
| Threonine* | Thr | T |
| Tryptophan* | Trp | W |
| Phenylalanine* | Phe | F |
| Cysteine | Cys | C |
The proteins of most organisms are built from these twenty amino acids. The three-letter codes are used in the genetic code table. Essential amino acids cannot be made by the human body and come from food; they are marked with *.
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