Nucleotide Symbols
| Symbol | Meaning | Complement | Significance | |
|---|---|---|---|---|
| A | A | T or U | Adenine | |
| C | C | G | Cytosine | |
| G | G | C | Guanine | |
| T or U | T | A | Thymine or Uracil | |
| M | A or C | K | aMino | |
| R | A or G | Y | puRine | |
| W | A or T | W | Weak (2 H-bonds) | |
| S | C or G | S | Strong (3 H-bonds) | |
| Y | C or T | R | pYrimidine | |
| K | G or T | M | Keto | |
| V | A or C or G | B | not T or not U | |
| H | A or C or T | D | not G | |
| D | A or G or T | H | not C | |
| B | C or G or T | V | not A | |
| N or X | A or C or G or T | X or N | aNy nucleotide |
DNA Alphabet
A C G T M R W S Y K B D H V N
| | | | | | | | | | | | | | |
T G C A K Y W S R M V H D B N
Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents
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