Symbol	Nuleotides	Group	Complement	Opposite
A	A	Adenosine	T	B
T	T	Thymidine/Uridine	A	V
G	G	Guanine	C	H	
C	C	Cytidine	G	D
K	GT	Keto	M	M
M	AC	Amino	K	K
R	AG	Purine	Y	Y
Y	CT	Pyrimidine	R	R
S	CG	Strong	S	W
W	AT	Weak	W	S
B	CGT	not A (B comes after A)	V	A
V	ACG	not T/U (V comes after U)	B	T
H	ACT	not G (H comes after G)	D	G
D	AGT	not C (D comes after C)	H	C
XN	GATC	any	N	.
.		none	.	N
