UASt regulatory sequences drive expression of an inverted repeat.
pupa, with Scer\GAL4phtm.PO
Expression of ph-pKK108787 in the prothoracic glands, under the control of Scer\GAL4phm.PO results in very large pupae, double larval mouthhooks (a common molting defect) and L2 prepupae. The latter phenotype occurs when larvae forego the molt to an L3 and directly molt from an L2 to a prepupa.