The PBac{TRE-3xP3-EYFP,p-tTA-K10} construct was designed for use as an enhancer construct, containing at its 3' end a potential enhancer trap sequence that consists of a minimal P\T promoter and first intron fused upstream of tTA driver sequence. The construct also contains the Avic\GFPEYFP.tetO.3xP3 allele as an internal reporter for tTA activity in insertion lines. However in a screen, insertions of PBac{TRE-3xP3-EYFP,p-tTA-K10} did not detect activity of endogenous enhancers.