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<p>of intravesicular contents from the cell. After secretion is complete, the fusion pore temporarily formed at the base of the porosome is sealed. Porosomes are few nanometers in size and contain many different types of protein, especially chloride and calcium channels, <a href="page.php?w=actin">actin</a>, and <a href="page.php?w=SNARE_%28protein%29">SNARE proteins</a> that mediate the <a href="page.php?w=Exocytosis">docking</a> and <a href="page.php?w=Exocytosis">fusion</a> of the <a href="page.php?w=Vesicle_%28biology_and_chemistry%29">vesicles</a></p><p>
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