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Figure 3.
Fig. 3. Base rotation by interconversion of sugar
puckers. (a) Top view of the base rotation caused by
interconversion of the sugar puckers. The sugar pucker of the
5'-residue (T, top) is in the S-type (Left) and the N-type
(Right), whereas that of the 3'-residue (A, bottom) is fixed in
the S-type. Note that the hydrogen-bonding vector is rotated
toward its major groove by the conversion from the S-type to the
N-type. (b) Two types of deoxyribose-base stacking. All residues
are in the S-type sugar pucker (Left) or the N-type (Right)
sugar pucker.
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