Symbol

Description

Bases Represented

A

adenosine/adenine

A

C

cytidine/cytosine

C

G

guanosine/guanine

G

T

thymidine/thymine

T

U

uridine/uracil

U

W

weak

A

T

S

strong

C

G

M

amino

A

C

K

keto

G

T

R

purine

A

G

Y

pyrimidine

C

T

B

not A

C

G

T

D

not C

A

G

T

H

not G

A

C

T

V

not T

A

C

G

N or -

any base (not a gap)

A

C

G

T