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Introduction:
With the exception of bacteria and blue-green algae, most cells contain a nucleus, a specialised component that is divided from the rest of the cell by a double layer called the nuclear membrane. This membrane has openings that likely allow big molecules to enter the cell and appears to be continuous with the endoplasmic reticulum, a network of membranes. The nucleus carries the genes, structures that hold the genetic information, and controls and regulates the functions of the cell such as growth and metabolism. Little structures called nucleoli are frequently detected inside the nucleus. The nucleoplasm is the gel-like matrix in which the nuclear parts are suspended.
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