<p>(<b>A</b>) Expression of I<sub>h</sub> channels in ACs suppresses ERG baseline oscillation. I<sub>h</sub> channels were expressed using anatomically restricted GAL4 drivers. Flies possessed one copy of the indicated drivers. (<b>B</b>) The fraction of flies that exhibit the ERG oscillation phenotype in each genotype. The number of recorded flies for each genotype is listed. (<b>C</b>) Expression of I<sub>h</sub> channels in <i>I</i><sub><i>h</i></sub> mutant (top) and <i>I</i><sub><i>h</i></sub>;<i>Lai-GAL4/UAS—I</i><sub><i>h</i></sub> (bottom) flies. Dissected whole brains were stained with anti-I<sub>h</sub> (green) and anti-24B10 (red) antibodies. L, lamina; M, medulla. (<b>D</b>) Intracellular recordings of photoreceptors show that I<sub>h</sub> channels expression in ACs suppresses rhythmical depolarization without light stimulation. The fractions of photoreceptors that exhibit rhythmic depolarization are presented in the right panel, and the numbers of recorded photoreceptors for each genotype are listed.</p
