n  title="" class="an ">&ensp;</span>stress <span  title="" class="an ">&ensp;</span>associated <span  title="" class="an ">&ensp;</span><span  title="Neuron" class="an Neuron">cell</span><span  title="" class="an ">&ensp;</span>death <span  title="" class="an ">&ensp;</span>Mutations <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span>perturb <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>function <span  title="" class="an ">&ensp;</