itle="" class="an ">&ensp;</span>We <span  title="" class="an ">&ensp;</span>conclude <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span><span  title="CAP" class="an CAP">NC</span><span  title="" class="an ">&ensp;</span>receptors <span  title="" class="an ">&ensp;</span>distinct <span  title="" class="an ">&ensp;</span>from <span  title="" class="an ">&ensp;</span>opioid <span  title="" class="an ">&ensp;</span>receptors <span  title="" class="an ">&ensp;</span>exist <sp