UAS regulatory sequences drive expression of a truncated form of RhoGAPp190 (truncated at amino acid 1028) that lacks the RhoGAP domain. The protein is tagged at the N-terminal end with Tag:MYC.
The rescue by RhoGAPp190mut.Scer\UAS.T:Hsap\MYC of the phenotype caused by expression of RhoGAPp190dsRNA.GAP.Scer\UAS under the control of Scer\GAL4OK107 is probably due to the titration of dsRNA (produced by RhoGAPp190dsRNA.GAP.Scer\UAS) by RhoGAPp190mut.Scer\UAS.T:Hsap\MYC mRNA.