>&ensp;</span>regulated <span  title="" class="an ">&ensp;</span>by <span  title="" class="an ">&ensp;</span><span  title="ProteinName" class="an ProteinName">c</span><span  title="ProteinName" class="an ProteinName">&ensp;</span><span  title="ProteinName, CAP" class="an ProteinName CAP">AMP</span><span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>contribute <span  title="" class="an ">&ensp;</span>to <span  title="" class="an ">&ensp;</span>pacemaker <span  title="" class