Nucleotide or amino acid sequences should be written in IUPAC single-letter codes. The single-letter codes supported in MEGA are as follows.
|
Symbols |
Name |
Remarks |
|
DNA/RNA |
|
|
|
A |
Adenine |
Purine |
|
G |
Guanine |
Purine |
|
C |
Cytosine |
Pyrimidine |
|
T |
Thymine |
Pyrimidine |
|
U |
Uracil |
Pyrimidine |
|
R |
Purine |
A or G |
|
Y |
Pyrimindine |
C or T/U |
|
M |
|
A or C |
|
K |
|
G or T |
|
S |
Strong |
C or G |
|
W |
Weak |
A or T |
|
H |
Not G |
A or C or T |
|
B |
Not A |
C or G or T |
|
V |
Not U/T |
A or C or G |
|
D |
Not C |
A or G or T |
|
N |
Ambiguous |
A or C or G or T |
|
|
|
|
|
Protein |
|
|
|
A |
Alanine |
Ala |
|
C |
Cysteine |
Cys |
|
D |
Aspartic Acid |
Asp |
|
E |
Glutamic Acid |
Glu |
|
F |
Phenylalanine |
Phe |
|
G |
Glycine |
Gly |
|
H |
Histidine |
His |
|
I |
Isoleucine |
Ile |
|
K |
Lysine |
Lys |
|
L |
Leucine |
Leu |
|
M |
Methionine |
Met |
|
N |
Asparagine |
Asn |
|
P |
Proline |
Pro |
|
Q |
Glutamine |
Gln |
|
R |
Arginine |
Arg |
|
S |
Serine |
Ser |
|
T |
Threonine |
Thr |
|
V |
Valine |
Val |
|
W |
Tryptophan |
Trp |
|
Y |
Tyrosine |
Tyr |
|
* |
Termination |
* |