The Nuclear Lamina
During interphase, eukaryotic cells are physically separated into a nuclear and a cytoplasmic compartment by a complex organelle, the nuclear envelope. The innermost layer of the nuclear envelope is a polymeric protein network (Fawcett, 1966; Fawcett, 1981) termed the nuclear lamina (NL) (Fig. 1), which is tightly associated with the nuclear pore complexes. Apposed to the cytoplasmic surface of the NL is the membrane component of the nuclear envelope, which consists of two lipid bilayers, containing intrinsic membrane proteins. It is likely that the NL is a ubiquitous feature found in all eukaryotic cells, although it is not always equally prominent by electron microscopy.
KeywordsNuclear Envelope Intermediate Filament Nuclear Membrane Xenopus Laevis Nuclear Pore Complex
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