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Exocytosis. Illustration of exocytosis, where substances produced or segregated inside a cell are transported to the cell membrane and released to the exterior. Secretory vesicles (lower left and centre) are found within the cell's cytoplasm (blue), carrying substances such as hormones and enzymes (red and yellow). When they reach the cell's plasma membrane, the vesicles fuse with the membrane to release their contents (upper right). For three forms of endocytosis (the reverse process), see images C023/8787, C023/8789 and C023/8793. For this artwork without labels, see image C023/8797.
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