| Amino Acid Codes |
| Amino Acid | One Letter Codes* | Three Letter Codes | Molecular Weight | MW Residue (MW-H20) |
| Alanine | A | Ala | 89.09 | 71.07 |
| Arginine | R | Arg | 174.20 | 156.18 |
| Asparagine | N | Asn | 132.12 | 114.10 |
| Aspartic acid | D | Asp | 133.10 | 115.08 |
| Cysteine | C | Cys | 121.16 | 103.14 |
| Glutamic acid | E | Glu | 147.13 | 129.11 |
| Glutamine | Q | Gln | 146.15 | 128.13 |
| Glycine | G | Gly | 75.07 | 57.05 |
| Histidine | H | His | 155.16 | 137.14 |
| Isoleucine | I | Ile | 131.18 | 113.16 |
| Leucine | L | Leu | 131.18 | 113.16 |
| Lysine | K | Lys | 146.19 | 128.17 |
| Methionine | M | Met | 149.21 | 131.19 |
| Phenylalanine | F | Phe | 165.19 | 147.17 |
| Proline | P | Pro | 115.13 | 97.11 |
| Serine | S | Ser | 105.09 | 87.07 |
| Threonine | T | Thr | 119.12 | 101.10 |
| Tryptophan | W | Trp | 204.23 | 186.21 |
| Tyrosine | Y | Tyr | 181.19 | 163.17 |
| Valine | V | Val | 117.15 | 99.13 |
* Use lower-case letters for D-amino acids