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An endosome is a vesicle that forms when the cell membrane invaginates and pinches off during endocytosis. Endocytosis is the process by which cells incorporate substances from outside the cell. These endosomes are part of the internal membrane system within eukaryotic cells. They play a role in the sorting and transport of materials within the cell and can fuse with other organelles, such as lysosomes, to break down internalized substances.1234

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