The nucleus. A membrane-bound organelle with envelope, nucleolus, cellular cytoplasm, nuclear pores. It's surrounded by rough endoplasmic reticulum.

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Photo credit: © Olha Pohrebnyak / Alamy / Afripics
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Keywords: anatomy, biological, biology, cell, chromatin, endoplasmic, envelope, health, medical, medicine, membrane, nuclear, nucleolus, nucleoplasm, nucleus, organelle, plasma, pore, reticulum, ribosome, ribosomes, science, structure, vector, vectors