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lüll Secretion machinery at the cell plasma membrane Jena BPCurr Opin Struct Biol 2007[Aug]; 17 (4): 437-43Secretion is a fundamental cellular process involving the regulated release of intracellular products from cells. Physiological functions such as neurotransmission, or the release of hormones and digestive enzymes, are all governed by cell secretion. Three critical activities occur at the cell plasma membrane to ensure secretion. Membrane-bound secretory vesicles dock, fuse, and expel their contents to the outside via specialized and permanent plasma membrane structures, called porosomes or fusion pores. In recent years, significant progress has been made in our understanding of these three key cellular activities required for cell secretion. The molecular machinery and mechanism involving them is summarized in this article.|Animals[MESH]|Cell Membrane/*chemistry/*physiology[MESH]|Humans[MESH]|Membrane Fusion[MESH]|Microscopy, Atomic Force[MESH]|Microscopy, Electron[MESH]|Secretory Vesicles/chemistry/*physiology[MESH] |