Fig. 7. Schematic representation of the spatiotemporal expression patterns of RH2 opsin subtypes in zebrafish retina (lateral views) reconstructed from ISH to serial sections. Expression areas of RH2-1, RH2-2 and RH2-3 are indicated with different shades of gray (light, middle and dark, respectively). That of RH2-4 is indicated with black. Dots in RH2-2 expression at two weeks pf indicates sparse expression in the central retina. Up to 1 month pf, expression of RH2-3 and RH2-4 was not distinguishable. D, dorsal; V, ventral; N, nasal; T, temporal.