An elav promoter drives expression of ewg. The 5' end of ewg is derived from cDNA sequence, while the 3' end is derived from genomic DNA (intron sequences from intron 4 onwards are present). A deletion within intron 6, starting at nucleotide 89 after the 5' splice site of intron 6 and extending to an MfeI site within the intron (removing about 75% of this intron) is present. A Tag:VSV-G tag and a Tag:HA tag have been added at the end of the open reading frames resulting from intron 6 spliced and unspliced mRNAs respectively.