IUPAC codes for nucleotides
(Single-letter codes based on International Union of Pure and Applied Chemistry)The information is gathered from: http://www.iupac.org and http://www.insdc.org/documents/feature_table.html.
| Code | Description |
|---|---|
| A | Adenine |
| C | Cytosine |
| G | Guanine |
| T | Thymine |
| U | Uracil |
| R | Purine (A or G) |
| Y | Pyrimidine (C, T, or U) |
| M | C or A |
| K | T, U, or G |
| W | T, U, or A |
| S | C or G |
| B | C, T, U, or G (not A) |
| D | A, T, U, or G (not C) |
| H | A, T, U, or C (not G) |
| V | A, C, or G (not T, not U) |
| N | Any base (A, C, G, T, or U) |