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Additional
cytosine
English Wikipedia - The Free Encyclopedia
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Cytosine
Cytosine
(;
C
) is one of the four main bases found in
DNA
and
RNA
, along with
adenine
,
guanine
, and
thymine
(
uracil
in RNA). It is a
pyrimidine
derivative, with a
heterocyclic
aromatic ring
and two substituents attached (an
amine
group at position 4 and a
keto
group at position 2). The
nucleoside
of cytosine is
cytidine
. In Watson-Crick
base pairing
, it forms three hydrogen bonds with
guanine
.
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