e="" class="an ">&ensp;</span>receptors <span  title="" class="an ">&ensp;</span><span  title="ProteinName" class="an ProteinName">m</span><span  title="ProteinName" class="an ProteinName">&ensp;</span><span  title="ProteinName" class="an ProteinName">Glu</span><span  title="ProteinName" class="an ProteinName">&ensp;</span><span  title="ProteinName" class="an ProteinName">R</span><span  title="" class="an ">&ensp;</span>on <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span