channel transportation from nucleus to cytoplasm (answer in one word)
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The nuclear envelope encloses the DNA and defines the nuclear compartment. This envelope consists of two concentric membranes that are penetrated by nuclear pore complexes . Although the inner and outer nuclear membranes are continuous, they maintain distinct protein compositions. The inner nuclear membrane contains specific proteins that act as binding sites for chromatin and for the protein meshwork of the nuclear lamina that provides structural support for this membrane. The inner membrane is surrounded by the outer nuclear membrane, which is continuous with the membrane of the ER. Like the membrane of the ER that will be described later in this chapter, the outer nuclear membrane is studded with ribosomes engaged in protein synthesis. The proteins made on these ribosomes are transported into the space between the inner and outer nuclear membranes (the perinuclear space), which is continuous with the ER lumen