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SlideshowReport

Nuclear envelope

Description
(a) The nucleus is bounded by a double membrane called the nuclear envelope. The nucleolus (arrow) is a prominent structure in the nucleus and is the site of ribosome synthesis. (b) The nuclear envelope is studded with pores, which allow exchange of materials between the nucleus and the cytoplasm. (c) When the cell is not dividing, the chromosomes are uncoiled and dispersed throughout the nucleus as clumps of chromatin, clustered just inside the nuclear envelope.
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