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IUPAC ambiguity codes are single-letter codes for nucleotides and amino acids established by the International Union of Pure and Applied Chemistry. This nomenclature is used for specifying Pattern Search parameters.

Nucleotides (Cornish-Bowden, 1985):

Symbol        Meaning
G        G
A        A
T        T or U
C        C
U        U or T
R        G or A
Y        T, U or C
M        A or C
K        G, T or U
S        G or C
W        A, T or U
H        A, C, T or U
B        G, T, U or C
V        G, C or A
D        G, A, T or U
N        G, A, T, U or C
Amino Acids:

1-Letter Symbol        3-Letter Symbol        Meaning
A        Ala        Alanine       
R        Arg        Arginine       
N        Asn        Asparagine       
D        Asp        Aspartic acid       
C        Cys        Cysteine       
Q        Gln        Glutamine       
E        Glu        Glutamic acid       
G        Gly        Glycine       
H        His        Histidine       
I        Ile        Isoleucine       
L        Leu        Leucine       
K        Lys        Lysine       
M        Met        Methionine       
F        Phe        Phenylalanine       
P        Pro        Proline       
S        Ser        Serine       
T        Thr        Threonine       
W        Trp        Tryptophan       
Y        Tyr        Tyrosine       
V        Val        Valine               
B        Asx        Asparagine or Aspartic acid
Z        Glx        Glutamine or Glutamic acid
X        ???        Unknown       
Cornish-Bowden, A. (1985). Nomenclature for incompletely specified bases in nucleic acid sequences: recommendations 1984. Nuc. Acids Res. 13:3021-3030.
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