UASt regulatory sequences drive expression of the last 108 carboxy-terminal residues of trk (which start at codon 119) with an N-terminal signal peptide tag (Tag:SS(ea)).
A mild but statistically significant advance in the time of pupariation is detected when trkC-108.Scer\UAS.T:SS-ea is expressed under the control of Scer\GAL4da.G32.
Females carrying three copies of trkC-108.Scer\UAS.T:ea expressed under the control of Scer\GAL4nos.UTR.T:Hsim\VP16 sometimes produce embryos with deletions of the middle body segments.