
Fig. 4. Representative absorbance spectra of rainbow trout rod photoreceptors. (A) Mean absorbance spectrum of rhodopsin-based rods (black line). This spectrum (red diamonds) and those in B (red triangles) and C (red circles) are fitted with long-wavelength limb templates taken from Munz and Beatty (Munz and Beatty, 1965). (B) Mean absorbance spectrum for mixed rhodopsin porphyropsin rods. (C) Mean absorbance spectrum for porphyropsin-based rods.