s="an ">&ensp;</span>significantly <span  title="" class="an ">&ensp;</span>diminished <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>inhibitory <span  title="" class="an ">&ensp;</span>effect <span  title="" class="an ">&ensp;</span>of <span  title="" class="an ">&ensp;</span>methionine <span  title="" class="an ">&ensp;</span>enkephalin <span  title="" class="an ">&ensp;</span>micro <span  title="" class="an ">&ensp;</span>M <span  title="" class="an ">&ensp;</span>b