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. 2012 Sep 24;7(9):e45103. doi: 10.1371/journal.pone.0045103

Table 2. Undetermined nucleotides and their substitutions [47].

Symbols Possible substitutions Origin and designation
R A,G puRine
Y C,T pYrimidine
M A,C aMino
K G,T Ketone
S C,G Strong interaction
W A,T Weak interaction
B C,G,T not-A, B follows A in alphabet
D A,G,T not-C, D follows C in alphabet
H A,C,T not-G, H follows G in alphabet
V A,C,G not-T/U, V follows U in alphabet
N A,G,C,T aNy