IUPAC codes for amino acids:
| 1-Letter Code | 3-Letter Code | Amino Acid |
|---|---|---|
| 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 | Unspecified or unknown |
| Y | Tyr | Tyrosine |
| Z | Glx | Glutamic Acid or Glutamine |
IUPAC codes for nucleotides:
| Symbol | Description | Bases Represented | |||
|---|---|---|---|---|---|
| A | adenosine/adenine | A | |||
| C | cytidine/cytosine | C | |||
| G | guanosine/guanine | G | |||
| T | thymidine/thymine | T | |||
| U | uridine/uracil | U | |||
| W | weak | A | T | ||
| S | strong | C | G | ||
| M | amino | A | C | ||
| K | keto | G | T | ||
| R | purine | A | G | ||
| Y | pyrimidine | C | T | ||
| B | not A | C | G | T | |
| D | not C | A | G | T | |
| H | not G | A | C | T | |
| V | not T | A | C | G | |
| N or - | any base (not a gap) | A | C | G | T |
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