Edit Description Molecular Sequences
Editing the description - Molecular sequence symbols
The editor for sequence data recognizes predefined symbols for nucleotide and protein sequences according the IUPAC definitions.
Nucleic acid symbols
Symbol | Name |
A | Adenine |
C | Cytosine |
G | Guanine |
T | Thymine |
U | Uracile |
W | Weak (A or T) |
S | Strong (G or C) |
M | aMino (A or C) |
K | Keto (G or T) |
R | puRine (G or A) |
Y | pYrimidine (C or T) |
B | not A (B comes after A) |
D | not C (D comes after C) |
H | not G (H comes after G) |
V | not T (V comes after T and U) |
N | No idea (not a gap) |
The symbols with grey background are ambiguity symbols. The difference between “N” and a gap symbol (usually “-”, but any other symbol may be defined in the descriptor) is that a gap symbol represents an unspecified number of unknown symbols but “N” stands for exatly one nucleic acid.
Amino acid symbols
Name | 1-letter sybmol | 3-letter sybmol |
Alanine | A | Ala |
Arginine | R | Arg |
Asparagine | N | Asn |
Aspartic acid | S | Asp |
Cysteine | C | Cys |
Glutamic acid | E | Glu |
Glutamine | Q | Gln |
Glycine | G | Gly |
Histidine | H | His |
Isoleucine | I | Ile |
Leucine | L | Leu |
Lysine | K | Lys |
Methionine | M | Met |
Phenylalanine | F | Phe |
Proline | P | Pro |
Serine | S | Ser |
Threonine | T | Thr |
Tryptophan | W | Trp |
Tyrosine | Y | Tyr |
Valine | V | Val |
Selenocysteine | U | Sec |
Pyrrolysine | O | Pyl |
Asparagine or aspartic acid | B | Asx |
Glutamine or glutamic acid | Z | Glx |
Leucine or Isoleucine | J | Xle |
Unspecified or unknown amino acid | X | Xaa |
The symbols with grey background are ambiguity symbols. The difference between “X” rsp. “Xaa” and a gap symbol (e.g. “—”, but any other symbol may be defined in the descriptor) is that a gap symbol represents an unspecified number of unknown symbols but “X” rsp. “Xaa” stand for exatly one amino acid. The amino acids “Selenocysteine” and Pyrrolysine" are non-standard amino acids that only occur in certain species.
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