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<p>including <a href="page.php?w=magnetoception">magnetoreception</a> and <a href="page.php?w=electroreception">electroreception</a>.</p>

<p><big>Receptors</big></p>
<p>The initialization of sensation stems from the response of a specific receptor to a physical stimulus. The receptors which react to the stimulus and initiate the process of sensation are commonly characterized in four distinct categories: <a href="page.php?w=chemoreceptors">chemoreceptors</a>, <a href="page.php?w=photoreceptor_cell">photoreceptors</a>, <a href="page.php?w=mechanoreceptors">mechanoreceptors</a>,</p><p>
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