ensp;</span>channel <span  title="" class="an ">&ensp;</span>contributes <span  title="" class="an ">&ensp;</span>predominantly <span  title="" class="an ">&ensp;</span>during <span  title="" class="an ">&ensp;</span>prolonged <span  title="" class="an ">&ensp;</span>activation <span  title="" class="an ">&ensp;</span>Injury <span  title="" class="an ">&ensp;</span>shifts <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>relative <span  title="" class="an ">&ensp;</span>c