an ">&ensp;</span>calcium <span  title="" class="an ">&ensp;</span>waves <span  title="" class="an ">&ensp;</span>showed <span  title="" class="an ">&ensp;</span>emerging <span  title="" class="an ">&ensp;</span>activity <span  title="" class="an ">&ensp;</span>within <span  title="" class="an ">&ensp;</span>neuronal <span  title="" class="an ">&ensp;</span>clusters <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>its <span  title="" class="an ">&ensp;</span>synchronizat