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Crystal structure of free ctCRM1 (gray). The acidic loop (green), the C-terminal helix (red) and the NES cleft (blue) are highlighted. The HEAT repeats are numbered, and termini are labeled. (Lower) Rotated detail view of the interactions of residues from the C-terminal helix with the acidic loop and a patch of CRM1 formed by helices of H8 to H12. Hydrogen bonds and salt bridges are represented by dashed lines, and interacting residues are labeled.
