ensp;</span>calcium <span  title="" class="an ">&ensp;</span>currents <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>after <span  title="" class="an ">&ensp;</span>hyperpolarization <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>rat <span  title="" class="an ">&ensp;</span>motoneurones <span  title="" class="an ">&ensp;</span>by <span  title="" class="an ">&ensp;</span>serotonin <span  t