an  title="" class="an ">&ensp;</span>of <span  title="" class="an ">&ensp;</span>two <span  title="" class="an ">&ensp;</span>N <span  title="" class="an ">&ensp;</span>terminal <span  title="" class="an ">&ensp;</span>acidic <span  title="" class="an ">&ensp;</span>residues <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span><span  title="CAP" class="an CAP">DPP</span><span  title="" class="an ">&ensp;</span>S <span  title="" class="an ">&ensp;</span>eliminated <span  titl