RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Internal cellular structure. Illustration of internal cellular structure, including the rough endoplasmic reticulum (lower left and lower right) and various cytoskeleton protein structures (rods and spindles). The sites of protein synthesis (linked spheres) are seen on the folded surfaces of the endoplasmic reticulum, while microtubules (rods) are formed of tubulin. At lower right are examples of spindles formed from microtubules. These spindles form during cell division. At centre (red) are strands of smooth endoplasmic reticulum.
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