In addition to the r-opsins, phototransduction pathway analyses of the organs of Pesta assembly identified a majority of the major pathway components including pathway regulating Gq-proteins, and the cascade terminators—retinal degeneration (rdg) and arrestin (Arr) (genes included Arr, DAGK, GPRK2, Gqα, Gqβ, R-opsin, PKC, rdgC). Here, SAG is linked to retinal degeneration.