When Mmus\Zfpm2^Δ.Scer\UAS is driven by Scer\GAL4^lz-gal4, no effect is seen on the number of crystal cells seen in stage 13-16 embryos. When Mmus\Zfpm2^Δ.Scer\UAS is driven by Scer\GAL4^twi.PB a reduction in the umber of cardiac cells is seen in embryos. An average of 40% of embryos have gaps in the heart tube ranging from 10 cells missing to a complete absence of cardiac cells. When Mmus\Zfpm2^Δ.Scer\UAS is driven by Scer\GAL4^ey.PH severe defects are seen in the eye. These include ectopic production of antennae, reduction or loss of the eye, disrupted ommatidial polarity. This combination is also lethal for about 80% of the population before eclosion.