Nucleotide nomenclature (IUPAC)
| Symbol | Meaning | Origin of designation |
|---|---|---|
| G | G | Guanine |
| A | A | Adenine |
| T | T | Thymine |
| C | C | Cytosine |
| R | G or A | puRine |
| Y | T or C | pYrimidine |
| M | A or C | aMino |
| K | G or T | Keto |
| S | G or C | Strong interaction (3 H bonds) |
| W | A or T | Weak interaction (2 H bonds) |
| H | A or C or T | not-G, H follows G in the alphabet |
| B | G or T or C | not-A, B follows A |
| V | G or C or A | not-T (not-U), V follows U |
| D | G or A or T | not-C, D follows C |
| N | G or A or T or C | aNy |
Complete IUPAC nomenclatur for bases in nucleic acids
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