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CC stacking pattern for the GCC4extended duplex for the OL15 results. Left figure shows the stacking of C6–C26 and C12–C20, right figure shows the stacking of C8–C23 after a rotation around the central axis. The stacking is not as strong as in BSC1 because the extruded C bases have hydrogen bonds with bases along the same strand. Hydrogen bonds are shown in purple inside the circles. The inset in the middle shows the close view of C12–C20 stacking.
