"an ">&ensp;</span>These <span  title="" class="an ">&ensp;</span>results <span  title="" class="an ">&ensp;</span>suggest <span  title="" class="an ">&ensp;</span>that <span  title="" class="an ">&ensp;</span><span  title="ProteinName" class="an ProteinName">Ca</span><span  title="" class="an ">&ensp;</span>entry <span  title="" class="an ">&ensp;</span>mechanisms <span  title="" class="an ">&ensp;</span>in <span  title="" class="an ">&ensp;</span>mammalian <span  title="" class="an ">&ensp;</span>photorec