Nuclear pore complexes (NPCs) are gateways for nucleocytoplasmic exchange. Intrinsically disordered nucleoporins (Nups) form a selective filter inside the NPC, taking a central role in the vital nucleocytoplasmic transport mechanism. How such intricate meshwork relates to function and gives rise to a transport mechanism is still unclear. Here we set out to tackle this issue in intact cells by an established combination of fluorescence correlation spectroscopy and real-time tracking of the center of mass of si…
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