Coloured transmission electron micrograph (TEM) showing pinocytosis, a type of endocytosis. The material is captured in invaginations of the cell membrane and pinocytic vesicles (light blue) that fuse in large vacuoles (light brown). Lysosomes (purple) join these vacuoles forming endosomes (green). Mitochondria (red) supply the energy for the process.

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