20 Amino acid
| Amino acid | Three letter code | One letter code |
|---|---|---|
| alanine | ala | A |
| arginine | arg | R |
| asparagine | asn | N |
| aspartic acid | asp | D |
| cysteine | cys | C |
| glutamic acid | glu | E |
| glutamine | gln | Q |
| glycine | gly | G |
| histidine | his | H |
| isoleucine | ile | I |
| leucine | leu | L |
| lysine | lys | K |
| methionine | met | M |
| phenylalanine | phe | F |
| proline | pro | P |
| serine | ser | S |
| threonine | thr | T |
| tryptophan | trp | W |
| tyrosine | tyr | Y |
| valine | val | V |
Information Source