Changes

<p><strong>- Neural stem cells</strong>Neural stem cells&nbsp;(<strong>NSCs</strong>) are self-renewing,&nbsp;<a href="https://en.wikipedia.org/wiki/Multipotency" title="Multipotency">multipotent</a>&nbsp;cells that generate the&nbsp;<a href="https://en.wikipedia.org/wiki/Neurons" title="Neurons">neurons</a>&nbsp;and&nbsp;<a href="https://en.wikipedia.org/wiki/Glia" title="Glia">glia</a>&nbsp;of the&nbsp;<a href="https://en.wikipedia.org/wiki/Nervous_system" title="Nervous system">nervous system</a>&nbsp;of all animals during&nbsp;<a href="https://en.wikipedia.org/wiki/Embryonic_development" title="Embryonic development">embryonic development</a>.</p>

<p>-&nbsp;NSCs are stimulated to begin differentiation via exogenous cues from the microenvironment, or stem cell niche. This capability of the NSCs to replace lost or damaged neural cells is called&nbsp;<a href="https://en.wikipedia.org/wiki/Neurogenesis" title="Neurogenesis">neurogenesis</a>.</p>