The nuclear envelope is the double-membrane boundary around a cell nucleus. Regulated passage connects nuclear processes to the surrounding cytoplasm: transcription produces RNA in the cell nucleus, while exported messenger RNA can undergo biological translation on ribosomes outside it. See NHGRI: nuclear membrane.
A nuclear pore complex is an assembly of proteins spanning the nuclear envelope and regulating passage between the cell nucleus and cytosol. It is a selective gateway, not simply an unregulated hole: messenger RNA export and import of nuclear proteins require appropriate transport machinery. See Alberts et al.: nuclear pore complexes.
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