Nucleus and nucleolus, illustration
Illustration of the nucleus (larger sphere) and nucleolus of an animal cell. The nucleus holds the cell's genetic material in the form of DNA (deoxyribonucleic acid). At its centre is a nucleolus, which is responsible for producing components of ribosomes, the cell's protein-manufacturing organelles. Surrounding the nucleus is the endoplasmic reticulum (ER). Some parts of the ER are studded with ribosomes (dots)., by JULIEN TROMEUR/SCIENCE PHOTO LIBRARY
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