"" class="an ">&ensp;</span>stimulating <span  title="" class="an ">&ensp;</span>effect <span  title="" class="an ">&ensp;</span>suggesting <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span>phosphorylation <span  title="" class="an ">&ensp;</span>is <span  title="" class="an ">&ensp;</span>not <span  title="" class="an ">&ensp;</span>likely <span  title="" class="an ">&ensp;</span>to <span  title="" class="an ">&ensp;</span>be <span  title="" class="an ">&ensp;</span>inv