THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY
Nucleolus. Coloured transmission electron micrograph of the nucleolus (blue), a component of the nucleus (orange) of a cell. The cell cytoplasm is green. The nucleolus is responsible for producing components of ribosomes, the cell's protein-manufacturing organelles.
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