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
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