Oooc oc

NUCLEOTIDE STRUCTURES

Purlne-contalnlng DNA nucleotides

Adenine

Pyrlmldlne-contalnlng DNA nucleotides

Thymine 0

0"

II 0

0"

OH H

Guanine

Cytosine

OH H

KH HA

W"

OH H

CANONICAL B-DNA DOUBLE HELIX

Ribbon model

Ball-and-stick model

Space-filling model

0 0

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