(E and F) ERGs were recorded from the indicated genotypes under dark-adapted (scotopic) conditions, and (E) intensity series and (F) b-wave amplitudes as a function of the logarithm of the flash intensity were determined. (F) Further illustrates that the relative influence of the mutations on the photoreceptors (indicated by the saturated a-wave amplitude, right graph) was not substantially different from their effect on the b-wave response (dominated by the bipolars, left graph) at the same intensity of 10 cd·s/m2.