Here is a list of IUPAC degenerate nucleotide codes. These specify where there is variation in the DNA code. These can be specified in primer design and are used to clone peptide libraries.
| A | Adenine | A |
| C | Cytosine | C |
| G | Guanine | G |
| T | Thymine (DNA) | T |
| U | Uracil (RNA) | 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 | Any | A/C/G/T |
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