Expression of ttk::Hsap\BCL669.Bcl6ΔN153.Scer\UAS under the control of Scer\GAL4hs.2sev results in a rough eye phenotype. The R7 cell is missing in more than 70% of the ommatidia in these flies and there are on average 5.2 outer photoreceptor cells per ommatidium. Most R3/R4 cells develop properly but R7 cells fail to become neurons in larval eye discs expressing ttk::Hsap\BCL669.Bcl6ΔN153.Scer\UAS under the control of Scer\GAL4hs.2sev. Expression of ttk::Hsap\BCL669.Bcl6ΔN153.Scer\UAS under the control of Scer\GAL4ey.PH is much less effective in disrupting eye formation than expression of ttk69.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4ey.PH.