IUPAC Codes for Nucleotides

IUPAC nucleotide code

IUPAC nucleotide code used in bioinformatics
BaseIUPAC nucleotide code
AdenineA
CytosineC
GuanineG
Thymine (or Uracil)T (or U)
Adenine or GuanineR
Cytosine or ThymineY
Guanine or CytosineS
Adenine or ThymineW
Guanine or ThymineK
Adenine or CytosineM
Cytosine or Guanine or ThymineB
Adenine or Guanine or ThymineD
Adenine or Cytosine or ThymineH
Adenine or Cytosine or GuanineV
any BaseN
gap. or -

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