Comparison of mean response waveform of WT, R9AP+/−, R9AP+/−;RKS561L, and R9AP+/−;Rv−/− rods to 20-ms flashes given at t = 0 for each rod type at the following light intensities (in photons µm⁻²): (A and B) 3, 9, 23, 75, 240, and 780; and (C and D) 9, 23, 75, 240, 780, and 2,800. (A) WT, mean of 12 rods. (B) R9AP+/−, mean of seven rods. (C) R9AP+/−;RKS561L, mean of nine rods. (D) R9AP+/−;Rv−/−, mean of nine rods. Red traces are responses for each rod type to flashes of 23 photons µm⁻². Note that averaging of rod responses tends to slur the decay phases of individual photoreceptors, which vary from rod to rod, with the result that the averaged response especially at bright intensities is not representative of any one individual cell. Mean decay times averaged cell by cell are given in Figs. 4 B and 5.