Claim: In the presence of nucleoside triphosphates and the small GTP binding protein Ran, the complex moves into the nuclear pore complex and the importin alpha enters the nucleoplasm with its passenger protein, while importin beta docks the complex at the cytoplasmic side of the nuclear pore complex.
Evidence: In the presence of nucleoside triphosphates and the small GTP binding protein Ran, the complex moves into the nuclear pore complex and the importin subunits dissociate. Importin alpha enters the nucleoplasm with its passenger protein and importin beta remains at the pore.