Fig. 4

Intensity-response relationships of zebrafish photoreceptor cells in absolute values (a) and in normalized values (b). The light purple curve is obtained after adjustment for the 5.5-fold higher sensitivity at λ_max compared to 405 nm for the UV cones. Plots are fitted with Naka-Rushton equation described in Methods and parameters shown in Table 2. R_max and I_1/2 are illustrated for rod data with dashed lines. Data are mean ± SEM. Numbers of data points are shown in Table 2.