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In page Nuclear pore complex:
"While translocation through the NPC is not energy-dependent, the overall import cycle needs the hydrolysis of two GTPs molecules, making it an active transport process. The import cycle is powered by the nucleo-cytoplasmic RanGTP gradient. This gradient arises from the exclusive nuclear localization of RanGEFs, proteins that exchange GDP to GTP on Ran molecules. Thus, there is an elevated RanGTP concentration in the nucleus compared to the cytoplasm.[citation needed]
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