Complements the suppression of the sev::tor13D.hs.sev extra R7 phenotype by drkR1/+. 76% of ommatidia in sev::tor13D.hs.sev; drkR1/+;drkSH3(N)SH2.hs.sev flies contain multiple R7 cells. Fails to rescue the embryonic lethality caused by drk mutations.