IUPAC Ambiguity Codes for Nucleotide Degeneracy
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| R = A or G | K = G or T | S = G or C |
| Y = C or T | M = A or C | W = A or T |
| B = not A (C, G or T) | H = not G (A, C or T) | N = any nucleotide |
| D = not C (A, G or T) | V = not T (A, C or G) |