A truncated, activated sevenless kinase overexpressed under the control of a duplicated sev enhancer.
sev amino acids 1865 to 2554, lacking most of the extracellular domain, encoded by cDNA are under the control of the duplicated sev enhancer and Hsp70 promoter. N-terminal signal sequence is provided by an inframe fusion with the signal peptide of Lcp3, and the protein is tagged with a Tag:MYC epitope.