# Standard Ambiguity Codes

## SNPs

Nucleotide ambiguity code as defined in DNA Sequence Assembler.

Symbol | Description | Bases represented | Complement
--- | --- | --- | ---
A | Adenine | A – – – | V
C | Cytosine | – C – – | H
G | Guanine | – – G – | D
T | Thymine | – – – T | B
W | Weak | A – – T | S
S | Strong | – C G – | W
M | aMino | A C – – | K
K | Keto | – – G T | M
R | puRine | A – G – | Y
Y | pYrimidine | – C – T | R
B | not A | – C G T | A
D | not C | A – G T | C
H | not G | A C – T | G
V | not T | A C G – | T
N | any Nucleotide | A C G T | Z
Z | Zero | – – – – | N

## Amino Acids and Codons

The standard ambiguity codes for nucleotides and for the one-letter and three-letter designations of amino acids. Notice that all the entries in the same row encodes to the corresponding amino acid.

Amino Acid (full) | 3-Let | 1-Let | Codons (triplets) | Compressed (compact)
--- | --- | --- | --- | ---
Alanine | Ala | A | GCT, GCC, GCA, GCG | GCN
Cysteine | Cys | C | TGT, TGC | TGY
Aspartic | Asp | D | GAT, GAC | GAY
Glutamic | Glu | E | GAA, GAG | GAR
Phenylalanine | Phe | F | TTT, TTC | TTY
Glycine | Gly | G | GGT, GGC, GGA, GGG | GGN
Histidine | His | H | CAT, CAC | CAY
Isoleucine | Ile | I | ATT, ATC, ATA | ATH
Lysine | Lys | K | AAA, AAG | AAR
Leucine | Leu | L | TTA, TTG, CTT, CTC, CTA, CTG | YTR, CTN
Methionine | Met | M | ATG |
Asparagine | Asn | N | AAT, AAC | AAY
Proline | Pro | P | CCT, CCC, CCA, CCG | CCN
Glutamine | Gln | Q | CAA, CAG | CAR
Arginine | Arg | R | CGT, CGC, CGA, CGG, AGA, AGG | CGN, MGR
Serine | Ser | S | TCT, TCC, TCA, TCG, AGT, AGC | TCN, AGY
Threonine | Thr | T | ACT, ACC, ACA, ACG | ACN
Valine | Val | V | GTT, GTC, GTA, GTG | GTN
Tryptophan | Trp | W | TGG |
Tyrosine | Tyr | Y | TAT, TAC | TAY