Complements the suppression of the sev::tor13D.hs.sev extra R7 phenotype by drkR1/+. sev::tor13D.hs.sev; drkR1/+ flies have 33% ommatidia with multiple R7 cells as opposed to 78% for sev::tor13D.hs.sev; drkR1/+;drkW189A.hs.sev flies. Partially rescues the embryonic lethality caused by drk mutations (20% rescue as opposed to 100% for drkhs.sev.