Nucleotide Ambiguity Colours
This colour scheme was devised by Suzanne Duce and the Jalview Team to highlight ambiguity codes used in nucleotide sequences.
The use of X to represent an unknown base is acknowledged, but this is not recommended as the symbol refers to xanthine (see IUPAC-IUB Commission on Biochemical Nomenclature (CBN). Abbreviations and Symbols for Nucleic Acids, Polynucleotides and their Constituents.)
A | Adenine |
C | Cytosine |
G | Guanine |
T | Thymine |
U | Uracil |
I | Inosine |
X | Unknown (sometimes Xanthine) |
R | Unknown Purine |
Y | Unknown Pyrimidine |
W | Weak nucleotide (A or T) |
S | Strong nucleotide (G or C) |
M | Amino (A or C) |
K | Keto (G or T) |
B | Not A (G or C or T) |
H | Not G (A or C or T) |
D | Not C (A or G or T) |
V | Not T (A or G or C) |
N | Unknown |