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<p><b>Thymic involution</b> is the shrinking (<a href="page.php?w=Involution_%28medicine%29">involution</a>) of the <a href="page.php?w=thymus">thymus</a> with age, resulting in changes in the architecture of the thymus and a decrease in tissue mass. Thymus involution is one of the major characteristics of vertebrate <a href="page.php?w=immunology">immunology</a>, and occurs in almost all <a href="page.php?w=vertebrates">vertebrates</a>, from birds, <a href="page.php?w=teleosts">teleosts</a>, amphibians to reptiles, although the thymi of a few species</p><p>
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