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<p>progenitors and their migration to their ultimate position, where they will differentiate into the mesoderm germ layer that, together with endoderm and ectoderm germ layers, will give rise to all the <a href="page.php?w=tissue_%28biology%29">tissues</a> of the adult organism.</p>

<p><big>Structure</big></p>
<p>The <a href="page.php?w=epiblast">epiblast</a>, a single <a href="page.php?w=epithelium">epithelial layer</a> of the <a href="page.php?w=bilaminar_embryonic_disc">bilaminar embryonic disc</a>, is the source of all embryonic material in <a href="page.php?w=amniote">amniote</a>s,</p><p>
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