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Secretion is the process of elaborating, releasing, and oozing chemicals, or a secreted chemical substance from a cell or gland. In contrast to excretion, the substance may have a certain function, rather than being a waste product. The classical mechanism of cell secretion is via secretory portals at the cell plasma membrane called porosomes.<ref name="pmid 22659300">{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Porosomes are permanent cup-shaped lipoprotein structure at the cell plasma membrane, where secretory vesicles transiently dock and fuse to release intra-vesicular contents from the cell.

Secretion in bacterial species means the transport or translocation of effector molecules for example: proteins, enzymes or toxins (such as cholera toxin in pathogenic bacteria for example Vibrio cholerae) from across the interior (cytoplasm or cytosol) of a bacterial cell to its exterior. Secretion is a very important mechanism in bacterial functioning and operation in their natural surrounding environment for adaptation and survival.

Secretion sections
Intro  Secretion in eukaryotic cells   Secretion in Gram negative bacteria   Secretion in Gram positive bacteria  See also   References    Bibliography   [[Secretion?section=External</a>_links|External</a> links]]  

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