A sev enhancer and Hsp70 promoter drives expression of a mutated form of drk that carries a W36A amino acid substitution in the N-terminal SH3 domain.
Fails to complement the suppression of the sev::tor13D.hs.sev extra R7 phenotype by drkR1/+. sev::tor13D.hs.sev; drkR1/+;drkW36A.hs.sev flies have 22% ommatidia with multiple R7 cells. Fails to rescue the embryonic lethality caused by drk mutations.