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PMC:1140370
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PMC:1140370
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4
/
6
/
7
makes
symmetric
dual
contacts
with
the
5
′
-
proximal
25
nt
single
-
stranded
segments
adjacent
to
the
branch
points
,
presumably
generating
double
hexamers
.
Loss
of
thymine
residues
from
o