Figure 4  Expression Patterns of Several Novel Cone Genes Up-Regulated in rd7
In the wild-type images (wt), note the scattered, weakly positive cells at the scleral edge of the outer nuclear layer in a cone distribution. All of the genes show marked up-regulation in the rd7 mutant. Bub1b and Tcta show transcript localization predominantly to the inner segment of the photoreceptors. Retinas are oriented such that the scleral edge is up. In addition to the ten genes that showed cone-specific expression in the wild-type retina, another 11 novel genes were derepressed in the rd7 retina by in situ hybridization (Figure 1, genes G36–G46).