ambiguity code

The standard ambiguity codes for nucleotides are provided by IUPAC (INTERNATIONAL UNION OF PURE AND APPLIED CHEMISTRY) and indicate the possible nucleotides that can occur at a given position. The symbols are valid for both DNA and RNA and are shown below: A = adenine C = cytosine G = guanine T = thymine R = G A (purine) Y = T C (pyrimidine) K = G T (keto) M = A C (amino) S = G C (strong bonds) W = A T (weak bonds) B = G T C (all but A) D = G A T (all but C) H = A C T (all but G) V = G C A (all but T) N = A G C T (any)

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