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Figure 3.
Figure 3. View[41.] of the PPT DNA 16-mer of form IVc with
its numbering scheme. The asterisk (*) in the center indicates
where the crystallographic 2-fold rotation axis bisects the
non-self-complementary DNA. In this view the 2-fold axis is
neither identically parallel with nor perpendicular to the
viewer, hence the distorted asterisk for emphasis. Each model
used in structural refinement is a different color. The DNA is
self-complementary in its first five and last five base-pairs,
then there is a "type" similarity (pyrimidine/pyrimidine) in
step 6 (11), then the A versus T and T versus A differences of
the middle four base-pairs.
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