span>of <span  title="" class="an ">&ensp;</span>photoreceptor <span  title="" class="an ">&ensp;</span><span  title="CAP" class="an CAP">CNG</span><span  title="" class="an ">&ensp;</span>cyclic <span  title="" class="an ">&ensp;</span>nucleotide <span  title="" class="an ">&ensp;</span>gated <span  title="" class="an ">&ensp;</span>channels <span  title="" class="an ">&ensp;</span>are <span  title="" class="an ">&ensp;</span>associated <span  title="" class="an ">&ensp;</span>with <span  title="" class="a