Specifically inhibits importin-beta-mediated nuclear import without disrupting transportin-mediated nuclear import or CRM1-mediated nuclear export1. When added to cells during mitosis it impairs the release of an importin- cargo probe and causes defects in spindle assembly. Inhibition of importin-beta function is most likely mediated by blocking its interaction with RanGTP. It is an important new tool to probe the function of the importin-/RanGTP pathway2-4. Cell permeable
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