DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour enhanced transmission electron micrograph of fenestrated cisternae of smooth reticulum in a guinea pig Leydig cell. This steroid secreting endocrine gland cell shows the typical spiral and concentric arrays of cisternae, organized around a lipid droplet near the top of the image.
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