UASt regulatory sequences drive expression of a Cka cDNA clone that encodes the PE isoform and includes Cka 3'UTR sequences. The coding sequence is tagged with TagBFP. The 3'UTR sequence has been mutated to change 9 of the 21 base pairs targeted by P{UAS-Cka.RNAi-B}, to render this transgene resistant to RNAi mediated by P{UAS-Cka.RNAi-B}.