DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour enhanced transmission electron micrographs of portions of the surface of polychromatophilic erythroblasts from guinea pig bone marrow. This series of images illustrates the intermediate stages in the formation of coated micropinocytotic vesicles. We see small thickened areas of membrane acquire an inner coat and a fuzzy external layer to which particles of ferritin adhere.
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