e="" class="an ">&ensp;</span>on <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>activity <span  title="" class="an ">&ensp;</span>of <span  title="" class="an ">&ensp;</span>either <span  title="" class="an ">&ensp;</span><span  title="ProteinName" class="an ProteinName">Ca</span><span  title="" class="an ">&ensp;</span>channel <span  title="" class="an ">&ensp;</span>type <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>neither <sp