atment <span  title="" class="an ">&ensp;</span>did <span  title="" class="an ">&ensp;</span>not <span  title="" class="an ">&ensp;</span>significantly <span  title="" class="an ">&ensp;</span>alter <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>basal <span  title="" class="an ">&ensp;</span>efflux <span  title="" class="an ">&ensp;</span>of <span  title="" class="an ">&ensp;</span>endogenous <span  title="" class="an ">&ensp;</span>amino <span  title="" class="an ">&e