Figure 7. Membrane potential of cells expressing different ChR variants.
The light stimulus (top) is identical to Figs. 5 and 6, with the range shifted 3 log units to dimmer intensities. Real-world luminance does not exceed 10−1 kW/m2, i.e. section −2 of the stimulus. The translation into equivalent real-world intensities is from [26]. A: cell response when wild-type ChR is expressed at a level of k exp = 100. B: Different version of ChR with a reversal potential of −25 mV. C: Comparison of responses with wild-type ChR for k exp = 100 and k exp = 2. D: Schematic representation of strategy 3, expressing ChR at different levels in distinct populations of bipolar cells.