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<p>packaged into secretory <a href="page.php?w=vesicle_%28biology%29">vesicles</a>, which are stored and released via <a href="page.php?w=exocytosis">exocytosis</a> in response to specific stimuli, such as an increase in intracellular Ca<sup>2+</sup> and cAMP levels.</p>

<p>Prohormones often contain extra amino acid sequences necessary for proper <a href="page.php?w=protein_folding">folding</a> but not for hormonal activity. Specific <a href="page.php?w=endopeptidase">endopeptidase</a>s cleave the prohormone before secretion, producing the mature,</p><p>
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