Nuclear pore complex is able to transport macromolecules with diameters of about 39 nm.

By N. Panté, M. Kann. Molecular Biology of the Cell, 2002

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The nuclear pore complex and nuclear transport. (2010, background): “This is on par with the size of the ribosomal subunits and viral capsids that are known to move as intact complexes (Pante and Kann 2002).”
Ultrafine Particles Cross Cellular Membranes by Nonphagocytic Mechanisms in Lungs and in Cultured Cells (2005, background): “Thus far, signalmediated transport via pores has been demonstrated only for ultrafine gold particles of up to 39 nm in diameter, through the nuclear pore complex in Xenopus oocytes, where transport velocities depended on particle size (Panté and Kann 2002).”
Toxicology of nanoparticles: A historical perspective (2007, background): “…as described recently in an excellent review by Smith and Helenius (2004), including viral entry into cells via clathrinmediated or caveolae-mediated pathways, their intracellular endosomal and caveosomal movement and entry into the cell-nucleus via 39 nm nuclear pore complex (Panté & Kann 2002).”