Nucleotide Base Codes (IUPAC)

Authority       Nomenclature Committee of the International Union of
                Biochemistry
Reference       Cornish-Bowden, A.  Nucl Acid Res 13, 3021-3030 (1985)
Contact         EMBL
Scope           Location descriptors, /codon

Listing

        Symbol  Meaning
        ------  -------

        a       a; adenine
        c       c; cytosine
        g       g; guanine
        t       t; thymine in DNA; uracil in RNA
        m       a or c
        r       a or g
        w       a or t
        s       c or g
        y       c or t
        k       g or t
        v       a or c or g; not t
        h       a or c or t; not g
        d       a or g or t; not c
        b       c or g or t; not a
        n       a or c or g or t