DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour-enhanced Transmission Electron Micrograph (TEM) of a section of a Nissl body showing free polysomes. A Nissl body is a large angular block of basophilic material, seen in neurons, composed of orderly arrays of cisternae of the endoplasmic reticulum. Nissl bodies are a site of protein synthesis.
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