Symbol  A  C  G  T
Bases  A  C  G  T
Symbol  U  R  Y  K
Bases  U  A,G  C,T  G,T
Symbol  M  S  W  B
Bases  A,C  G,C  A,T  C,G,T
Symbol  D  H  V  N
Bases  A,G,T  A,C,T  A,C,G  A,C,G,T