nuclear envelope

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nuclear envelope (nuclear membrane) The structure that separates the nucleus of eukaryotic cells from the cytoplasm. It comprises 2 unit membranes each 10nm thick, separated by a perinuclear space of 10–40nm. At intervals, the 2 membranes are fused around the edges of circular pores (nuclear pores) which allow for the selective passage of materials into and out of the nucleus.

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