D to G mutation within the Six domain.
Expression of OptixD-G.Scer\UAS in the eye disc anterior to the morphogenetic furrow, under the control of Scer\GAL4ey.PH, does not affect eye development. However, expression in the eye disc posterior to the morphogenetic furrow, driven by Scer\GAL4GMR.PF, results in a rough eye phenotype in adults.