othesis <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span><span  title="CAP" class="an CAP">UTP</span><span  title="" class="an ">&ensp;</span>may <span  title="" class="an ">&ensp;</span>be <span  title="" class="an ">&ensp;</span>an <span  title="" class="an ">&ensp;</span>endogenous <span  title="" class="an ">&ensp;</span>nociceptive <span  title="" class="an ">&ensp;</span>messenger <span  title="" class="an ">&ensp;</span>Furthermore <span  title="" class="an ">&en