sev-, sev::tor12D.hs.sev flies, also carrying Jrafl.hs.sev.T:Ivir\HA1, show a cone cell to R7 transformation.
In a sev- background, flies have rough eyes. Similar to sevS11.T:Hsap\MYC : transformation of mystery and cone cells into R7. Weaker effect than for sev::tor13D.hs.sev. Phenotype shows cold sensitivity.
Used to study effects of constitutive activation of sev using tor sequences from gain of function tor alleles.