>&ensp;</span>contraction <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>isolated <span  title="" class="an ">&ensp;</span>guinea <span  title="" class="an ">&ensp;</span>pig <span  title="" class="an ">&ensp;</span>ileum <span  title="" class="an ">&ensp;</span>Nociceptin <span  title="" class="an ">&ensp;</span><span  title="CAP" class="an CAP">NC</span><span  title="" class="an ">&ensp;</span>is <span  title="" class="an "