ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Illustration of organelles in an animal cell. At centre is the nucleus (transparent), which contains chromosomes (red) that hold the cell's genetic information. Endoplasmic reticulum (ER, pink) is the site of lipid synthesis and the production of membrane-bound proteins. The Golgi body (yellow) modifies and packages proteins. Mitochondria (green) provide the cell with energy. Cilia (finger-like projections) move particles on the exterior of the cell.
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