UASt regulatory sequences drive expression of serp 5'UTR and coding sequences in which the Chitin-binding domain (ChtB) is removed (amino acids 46-105), fused to a EGFP tag.
Tracheal expression of serpΔChtB.Scer\UAS.T:Avic\GFP-EGFP, under the control of Scer\GAL4btl.PS does not cause any detectable luminal or tube-extension phenotype.