Expression of ScrTn10\tetO.T:Ivir\HA1 driven by Tn10\tetRhs.T:Hsim\VP16 causes drastic transformations and defects in the larval head, including defects in head involution. The phenotypes seen in the larval head are indistinguishable to those seen in Scrhs.PG flies. Ectopic salivary glands are also seen in embryos of this genotype.