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Figure 1.
X-ray crystal structure of the CBC–importin-   IBB
complex. CBP80 is shown as a surface (gray), whereas CBP20 and
importin- are
depicted by ribbon diagrams (orange and green, respectively).
Shown above in stereoview is the N-terminal region of CBP80,
residues 2–22 (represented by sticks), which contains the NLS
segment of this protein, along with its 2F[o] – F[c] map
contoured at 1  .
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