Transmission electron micrograph (TEM) showing pinocytosis. Pinocytosis is a type of endocytosis in which small molecules dissolved in extracellular fluid are brought into the cell through an invagination of the cell membrane (pinocytic vesicles) that fuses forming early endosomes (vacuoles) and lysosomes to hydrolyse the particles.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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