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<p>progenitors. This helps form the precursors needed for certain organs and the embryo to develop. In summary, the notochord plays essential roles in embryonic development.</p>

<p>The notochord provides a directional reference to the surrounding tissue as a midline structure during <a href="page.php?w=embryonic_development">embryonic development</a>, acts as a precursor for vertebrae and a primitive axial <a href="page.php?w=endoskeleton">endoskeleton</a>. In aquatic animals it can facilitate tail motion when swimming.</p>

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