An Hsp83 promoter drives expression of a mutated Cbl S isoform which is defective in E3 enzyme activity.
CblS.Δ70Z.Hsp83 fails to rescue CblF165
Expression of CblS.Δ70Z.Hsp83 in the follicle cell somatic clones homozygous for CblF165 does not rescues the loss of cytoophidia (CTPsyn filaments) in stage 9 egg chambers.