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Nucleotides (Cornish-Bowden, 1985):
Symbol        Meaning
G        G
A        A
T        T or U
C        C
U        U or T
R        G or A
Y        T, U or C
M        A or C
K        G, T or U
S        G or C
W        A, T or U
H        A, C, T or U
B        G, T, U or C
V        G, C or A
D        G, A, T or U
N        G, A, T, U or C
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predicted genes: 16 motifs without a mismatch, 25 motifs
with one mismatch, and 420 motifs with two mismatches
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to do a whole genome search allowing two or three mismatches,
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