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<p><b>Microglia</b> are a type of <a href="page.php?w=glia">glial cell</a> located throughout the <a href="page.php?w=brain">brain</a> and <a href="page.php?w=spinal_cord">spinal cord</a> of the <a href="page.php?w=central_nervous_system">central nervous system</a> (CNS). Microglia account for about around 5-10% of cells found within the brain. As the resident <a href="page.php?w=macrophage">macrophage</a> cells, they act as the first and main form of active immune defense in the CNS. Microglia originate in the yolk sac under tightly regulated molecular</p><p>
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