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Figure 2.
Fig. 2. Stereo view of the least-squares superposition of
type I (black) and type II (red) helices viewed perpendicular to
the helix axis and into the major groove of the internal loop.
The bulged nucleotides A21 and U25 protrude from the helix. The
helical axes are bent by  17° for
type I and 8° for
type II duplexes.
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