Table 1

IUPAC nomenclature for nucleic acids.

Symbol

Meaning

Origin of designation


G

G

Guanine

A

A

Adenine

T

T

Thymine

C

C

Cytosine

R

G or A

puRine

Y

T or C

pYrimidine

M

A or C

aMino

K

G or T

Ketone

S

G or C

Strong interaction (3 H bonds)

W

A or T

Weak interaction (2 H bonds)

H

A or C or T

not-G, H follows G in the alphabet

B

G or T or C

not- A, B follows A

V

G or C or A

not-T (not-U), V follows U

D

G or A or T

not-C, D follows C

N

G or A or T or C

aNy


Aguirre-Hern├índez et al. BMC Bioinformatics 2007 8:34   doi:10.1186/1471-2105-8-34

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