When single cells in the developing retina are made rstIR.Scer\UAS Scer\GAL4Act5C.PI (by FLP out) interommatidial precursor cells (IPCs) are selectively lost from the ratio of rstIR.Scer\UAS Scer\GAL4Act5C.PI primary precursors to rstIR.Scer\UAS Scer\GAL4Act5C.PI IPCs at 42 hours APF is 1:1 rather than the 2:1 seen in wild-type.