Fig. 4.

Visual gene expression in head and dermal tissues in larval (L) and adult (A) stages of B. betularia. a Expression of nine visual gene isoforms relative to a control gene (spectrin) in head (light blue) and body tissue (dark blue). b Expression of the same visual genes in the skin (dark blue) relative to the head (light blue), calculated as [dermal expression/(head + dermal expression)]. Bars show standard errors (n = 4 biologically independent replicates for each stage). Gene names: Arr-1 = arrestin-1, RDB = retinal degeneration B, UVA = ultraviolet wavelength sensitive opsin isoform A, BlA = blue wavelength sensitive opsin isoform A, BlB = blue wavelength sensitive opsin isoform B, MelA = melanopsin isoform A, MelB = melanopsin isoform B, LW1 = long wavelength sensitive opsin copy one, and LW2 = long wavelength sensitive opsin copy two