Sif overexpression resembles the aPKC-CAAX phenotype while sif RNAi rescues aPKC-CAAX's phenotype. Sif overexpression resembles the aPKC-CAAX phenotype that displays large ectopic protrusions and outstretched border cells. Expression of sif RNAi rescues aPKC-CAAX's phenotype. Scale bars: 10μm.