UASt regulatory sequences drive expression of a 1.6kb Ggal\SerpinI1 coding sequence derived from the sc13a1 cDNA sequence.
Lethality and molting defects are observed when Ggal\SerpinI1Scer\UAS is expressed using Scer\GAL4how-24B to drive expression in muscles and other mesodermally derived tissues, nerves, and trachea, as well as a subset of cells in the CNS (with the larvae arresting development at the L1 to L2 ecdysis).
Larvae overexpressing Ggal\SerpinI1Scer\UAS under the control of Scer\GAL4how-24B or Scer\GAL4dimm-929 are able to proceed to the sclerotised double mouthhooks and double ventral plates stage normally but then remain trapped there for up to 24 hours (compared to the whole period lasting for about 1 hour in wild-type).