| 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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