PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY PROFESSORS P. MOTTA & T. NAGURO / SCIENCE PHOTO LIBRARY
Endoplasmic reticulum. Coloured high resolution scanning electron micrograph of endoplasmic reticulum (ER) in an olfactory epithelium supporting cell. ER is a network of folded membranes forming sheets, tubes or flattened sacs in the cell cytoplasm. It is the site of specific enzymically controlled biochemical reactions. On the surface of some of the ER membranes are ribosomes (yellow spheres). Ribosomes are involved in protein synthesis. They give the ER a granular appearance and give rise to the name "rough" ER. Other ER membranes have no ribosomes and are called "smooth" ER.
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