UASt regulatory sequences drive expression of a catalytically dead form of tok (amino acid replacement S669F).
tokcd.UAS.Tag:HA/Scer\GAL4da.G32 fails to rescue tokΔ2-41/tokE1
Scer\GAL4elav-C155/tokcd.UAS.Tag:HA fails to rescue tokΔ2-41/tokE1