UASt regulatory sequences drive expression of a truncated form of caps which lacks the PDZ domain.
tracheal dorsal trunk primordium, with Scer\GAL4twi.PG
Embryos that express capsΔPDZ.Scer\UAS under the control of Scer\GAL4twi.PG show tracheal defects; the dorsal trunk shows gaps and this phenotype is more severe at stage 14 than in later embryonic stages.