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The nuclear pore complex (NPC) is the conduit in the nuclear envelope through which proteins and RNA are transported between the cytoplasm and nucleus. Xenopus egg extracts that support de novo assembly of nuclei have provided a robust system to study NPC structure and function because the biochemical composition of the extract can be easily manipulated. Here we describe how to assemble nuclei in Xenopus egg extract, how to visualize and analyze NPCs in both live and fixed samples, and different approaches to altering nucleocytoplasmic transport in extract.
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