IFT88 and retinal degeneration: Among 260 conserved genes between ift88−/− versus ift88+/+ and ift172−/− versus ift172+/+at 5 dpf (these mutants had the strongest retinal degeneration), we defined 65 retinal-associated differentially expressed genes (DEGs) (Fig. 4C; Fig. S9, Table S4).