 class="an ">&ensp;</span><span  title="Neuron" class="an Neuron">neurons</span><span  title="" class="an ">&ensp;</span>At <span  title="" class="an ">&ensp;</span>immature <span  title="" class="an ">&ensp;</span>synapses <span  title="" class="an ">&ensp;</span><span  title="Neuron" class="an Neuron">cells</span><span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>culture <span  title="" class="an ">&ensp;</span>for <span  title="" class="an ">&ensp;</span>d <span  title="