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Cell interior, illustration
Illustration of the structure of a typical animal cell. The cell nucleus is at bottom. It holds the cell's genetic material in the form of DNA (deoxyribonucleic acid). Surrounding the nucleus is the endoplasmic reticulum (ER). Some parts of the ER are studded with ribosomes (dots), sites of active protein synthesis. Vesicles (spheres) leave the rough ER, releasing their protein cargo into the Golgi apparatus where the proteins are stored before being re-packaged for transport., by FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY
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