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<p><b>Second messengers</b> are <a href="page.php?w=intracellular_signaling">intracellular signaling</a> molecules released by the target cell in response to exposure to extracellular signaling molecules--the <b>first messengers</b>. (Intercellular signals, a non-local form of <a href="page.php?w=cell_signaling">cell signaling</a>, encompassing both first messengers and second messengers, are classified as <a href="page.php?w=autocrine_signaling">autocrine</a>, <a href="page.php?w=juxtacrine_signalling">juxtacrine</a>, <a href="page.php?w=paracrine_signaling">paracrine</a>,</p><p>
<a accesskey="3" href="page.php?w=Second_messenger_system&amp;p=2">3.Next</a>
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