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IUPAC code for incomplete nucleic acid specification
| Symbol | Mnemonic | Translation |
|---|---|---|
| A | A (adenine) | |
| C | C (cytosine) | |
| G | G (guanine) | |
| T | T (thymine) | |
| U | U (uracil) | |
| R | puRine | A or G (purines) |
| Y | pYrimidine | C or T/U (pyrimidines) |
| M | aMino group | A or C |
| K | Keto group | G or T/U |
| S | Strong interaction | C or G |
| W | Weak interaction | A or T/U |
| H | not G | A, C or T/U |
| B | not A | C, G or T/U |
| V | not T/U | A, C or G |
| D | not C | A, G or T/U |
| N | aNy | A, C, G or T/U |
