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Fig. 4 Scotopic ERGs of wild-type and pdzk1-KO larvae. (a) Group average ERG traces. Wild-type and pdzk1-KO larvae responses are shown as black and cyan lines, respectively, at −2.11, −0.81, 0.72, 1.89, and 2.48 log cd·s·m−2. Scale bar: 50 µV. The light bands around group average traces represent ±1 SEM. Note that the a-wave is not visible in the group averages owing to variability in the implicit time, which causes the individual traces to cancel out. Remaining panels show group average (±SEM) (b) a-wave amplitude, (c) a-wave implicit time, (d) b-wave amplitude, and (e) b-wave implicit time for wild-type (black circles) and pdzk1-KO (cyan triangles) larvae. Lines were fit using a four-parameter sigmoidal function. Data were compared using two-way ANOVA with Bonferroni correction. *P < 0.05; ****P < 0.0001.