Fig. 3. Waveform and amplitude of WT and ILE86TER rods.

(A). Mean responses averaged from 10 WT rods to responses of 20 ms flashes of the following intensities (in photons µm⁻²): 3.9, 17, 43, 159, 453, and 1120. (B). Mean responses averaged from 18 ILE86TER rods to responses of 20 ms flashes of the following intensities (in photons µm²): 17, 43, 159, 453, 646, 1120, 1870, and 3250. (C). Peak amplitude of responses with SE as a function of intensity from 10 WT rods and 18 ILE86TER rods; same rods as in Figs. 3A and 3B. Means have been fitted with the exponential saturation function [46] of the form r = r_max [1 − exp(−kI)] where r is the peak amplitude of the response, r_max is the maximum value of the peak response amplitude at bright flash intensities, I is the flash intensity, and k is a constant. Best-fitting values were k = 0.019 photons⁻¹ µm² and r_max of 15.5 pA for WT rods, and k = 0.006 photons⁻¹ µm² and r_max of 8.1 pA for ILE86TER rods. (D). Mean responses from the same rods as in Figs. 3A and 3B to the same flash of intensity 17 photons µm⁻². Declining waveforms of responses have been fitted with Equation (1); see text. Insert. Initial time courses of responses (with SE) are given on a faster time base to illustrate much slower rate of rise of ILE86TER response.