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Phosphate-
deoxyribose
backbone
Adenine
Cytosine
Guanine
Thymine
O
O
P
O
−
O
O
−
OH
O
O
O
−
P
O
O
OH
−
NH
2
N
N
N
N
H
2
N
N
N
N
N
NH
2
N
N
O
H
2
N
N
N
O
O
NH
N
O
O
HN
N
O
O
N
NH
N
N
NH
2
O
N
HN
N
N
H
2
N
3′ end
5′ end
3′ end
5′ end
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