Table 3.
IUPAC alphabet (ΣIUPAC).
| Symbol | A | C | G | T |
| Bases | A | C | G | T |
| Symbol | U | R | Y | K |
| Bases | U | A,G | C,T | G,T |
| Symbol | M | S | W | B |
| Bases | A,C | G,C | A,T | C,G,T |
| Symbol | D | H | V | N |
| Bases | A,G,T | A,C,T | A,C,G | A,C,G,T |
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