Expression of FrlCA.Scer\UAS driven by Scer\GAL4hs.2sev causes a severe rough eye phenotype; when driven by Scer\GAL4sev.EP there is a loss of R-cells. Co-expression of FrlCA.Scer\UAS does not alter the phenotype in flies with FrlDN.Scer\UAS driven by Scer\GAL4sev.EP.