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Animal cell, illustration
Illustration of the structure of a typical animal cell. The cell nucleus is at upper centre. It holds the cell's genetic material in the form of DNA (deoxyribonucleic acid). Surrounding the nucleus is the endoplasmic reticulum (ER, green). Some parts of the ER are studded with ribosomes, sites of active protein synthesis. Mitochondria (blue) are the sites of energy synthesis within the cell. At lower centre is a clathrin vesicle (green cage).
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