Amino Acid Code Converter
Convert between single-letter and three-letter amino acid codes, and look up details for amino acids and nucleotides.
Amino Acid Codes
| 1-Letter | 3-Letter | Name |
|---|---|---|
| A | Ala | Alanine |
| B | Asx | Aspartic acid or Asparagine |
| C | Cys | Cysteine |
| D | Asp | Aspartic Acid |
| E | Glu | Glutamic Acid |
| F | Phe | Phenylalanine |
| G | Gly | Glycine |
| H | His | Histidine |
| I | Ile | Isoleucine |
| J | Xle | Leucine or Isoleucine |
| K | Lys | Lysine |
| L | Leu | Leucine |
| M | Met | Methionine |
| N | Asn | Asparagine |
| O | Pyl | Pyrrolysine |
| P | Pro | Proline |
| Q | Gln | Glutamine |
| R | Arg | Arginine |
| S | Ser | Serine |
| T | Thr | Threonine |
| U | Sec | Selenocysteine |
| V | Val | Valine |
| W | Trp | Tryptophan |
| X | Xaa | Any amino acid |
| Y | Tyr | Tyrosine |
| Z | Glx | Glutamine or Glutamic acid |
| * | Ter | Termination |
| - or . | Gap | Gap |
Nucleotide Codes
| Code | Meaning |
|---|---|
| A | Adenine |
| C | Cytosine |
| G | Guanine |
| T | Thymine |
| U | Uracil |
| R | A or G |
| Y | C or T |
| S | G or C |
| W | A or T |
| K | G or T |
| M | A or C |
| B | C or G or T |
| D | A or G or T |
| H | A or C or T |
| V | A or C or G |
| N | Any base |
| - or . | Gap |