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Nucleus
The document provides details about the structure and functions of the nucleus. It notes that the nucleus was discovered by Robert Brown in 1831 and is considered the control center of the cell. It contains nuclear membranes, nucleoplasm, chromatin reticulum, and nucleolus. The nuclear membrane contains pores that allow transport of molecules between the nucleus and cytoplasm. The nucleolus forms in the nucleolar organizer region and is involved in ribosome biogenesis. The main functions of the nucleus include controlling metabolism, synthesizing and processing RNA, and storing and assembling ribosomes.
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