Expanded Letter Code
In addition to the conventional GATC symbols, there is an expanded letter code to indicate a position within a sequence that may be flexible when defining sequences.
| Letter | Nucleotide(s) included |
|---|---|
| A | A |
| T | T |
| G | G |
| C | C |
| R | G or A |
| Y | T or C |
| M | A or C |
| K | G or T |
| S | G or C |
| W | A or T |
| H | A or C or T |
| B | G or T or C |
| V | G or C or A |
| D | G or T or A |
| N | G or T or A or C |
For example, if the sequences known to bind protein X are known to be AAAAAAGAAA, AAAAAACAAA, AAAAAATAAA, and AAAAAAAAAA, this can be expressed as AAAAAANAAA.
Read more about this topic: Nucleic Acid Nomenclature
Famous quotes containing the words expanded, letter and/or code:
“The very nursery tales of this generation were the nursery tales of primeval races. They migrate from east to west, and again from west to east; now expanded into the “tale divine” of bards, now shrunk into a popular rhyme.”
—Henry David Thoreau (1817–1862)
“Your letter of excuses has arrived. I receive the letter but do not admit the excuses except in courtesy, as when a man treads on your toes and begs your pardon—the pardon is granted, but the joint aches, especially if there is a corn upon it.”
—George Gordon Noel Byron (1788–1824)
“... the self respect of individuals ought to make them demand of their leaders conformity with an agreed-upon code of ethics and moral conduct.”
—Mary Barnett Gilson (1877–?)