tle="" class="an ">&ensp;</span>for <span  title="" class="an ">&ensp;</span>proper <span  title="" class="an ">&ensp;</span>function <span  title="" class="an ">&ensp;</span>of <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>Trpa <span  title="" class="an ">&ensp;</span>gene <span  title="" class="an ">&ensp;</span>were <span  title="" class="an ">&ensp;</span>deleted <span  title="" class="an ">&ensp;</span>Knockout <span  title="" class="an ">&ensp;</span>mice <span 