="" class="an ">&ensp;</span>using <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>skin <span  title="" class="an ">&ensp;</span>nerve <span  title="" class="an ">&ensp;</span>preparation <span  title="" class="an ">&ensp;</span>from <span  title="" class="an ">&ensp;</span>adult <span  title="" class="an ">&ensp;</span>mouse <span  title="" class="an ">&ensp;</span>The <span  title="" class="an ">&ensp;</span>P <span  title="" class="an ">&ensp;</span>Y <span  title=""