UASt regulatory sequences drive expression of serp 5'UTR and coding sequences in which the Low-Density Lipoprotein Receptor (LDLR) domain is removed (amino acids 124-161), fused to a EGFP tag.
Tracheal expression of serpΔLDLR.Scer\UAS.T:Avic\GFP-EGFP, under the control of Scer\GAL4btl.PS does not cause any detectable luminal or tube-extension phenotype.