DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Scanning electron micrograph of a 3T3 cell in culture. This image demonstrates pinocytosis cell drinking, where a cell takes droplets of fluid medium into the cytoplasm. Sites of pinocytotic activity can be seen at the ends of three of the processes of the cell, where there are conspicuous undulating membranes or ruffles. The rest of the cell surface is smooth or bears sparse microvilli. Enhancement of 9E1434.
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